The Bose Aviation Headset X

Owners Guide

Safety Information
We, the offerer: Bose Corporation, The Mountain, Framingham, MA 01701-9168 USA Acknowledge our sole responsibility, that the product: Kind of equipment: Bose Aviation Headset X Type Designation: AHX-02, AHX-03, AHX-04, AHX-05, AHX-06, AHX-07, AHX-08
is in compliance with the following norm(s) or document(s): EMC-directive 89/336/EEC Accredited test laboratory: Mikes Product Service GmbH, Ohmstrasse 2-4, D-94342 Stasskirchen, Germany EC Certificate of Conformity #: E008, TCF#: Z16260
5 April 1999 Bose Products B.V. Nijverheidstraat 8, 1135 GE Edam The Netherlands
Nic Merks Vice President Europe Manufacturers authorized EU representative

Cautions and Advisories

Operational advisory
The Bose Aviation Headset X, an active noise reducing (ANR) headset, is a complex electronic device. As with any complex device, it is possible for this headset to fail during operation. Failure may include loud tones, distortion, and loss of communications signal in the headset when used in the ANR mode. The headset includes redundant circuitry to reduce the effects of such failures.
Note: Such failures could prevent continued use of the headset in the ANR mode.
The headset is in the ANR mode when the control module power switch, shown in Figures 5 and 6, is set to ON. The headset is in the passive mode when the power switch is set to OFF. If you experience loud tones and the related loss of communications, turn off the power switch. The headset will continue to provide communications in the passive noise attenuation mode. If you own a battery powered headset, it should be connected only to the battery power. An aircraft powered headset should be connected to the aircraft power sources only as described in this guide. The aircraft powered headset will not operate properly if used with a Bose Series II battery pack or with any commercial battery pack.

Hearing safety

Note: The headset is intended to be used with ANR turned on. Noise reduction and communications performance are reduced with the headset turned off.

Volume control

The volume controls affect the volume of the communications signal coming into the headset whether the ANR is on or off. As pilot in command, you must ensure that with ANR off you can understand critical communications. You may need to turn up the aircraft communications system volume when the headset is turned off. The aircraft communications system volume control should be easily accessible. Avoid setting the volume controls at levels high enough to impair your hearing during extended periods of headset use. 3
Listening to your aircraft With the headsets combination of both active and passive attenuation, typical aircraft sounds (for example, those from engines, propellers, warning alarms, and other sound sources) may sound different to you.
We strongly recommend that, as a responsible pilot, you ensure that you can hear and recognize these sounds when using the Bose Aviation Headset X while operating any aircraft.
Entertainment audio sources In addition, should you choose to listen to in-flight entertainment through a Bose Aviation Headset X while piloting, we remind you to limit the volume to safe levels that do not interfere with your ability to hear informational sounds and warning alarms, such as stall warnings or gear up.

Cautions

Protective inner screen The protective inner screen, shown in Figure 1, is a component critical to the headsets ability to reduce noise. Do not attempt to remove, replace, or repair this screen. If operating problems indicate the need for screen replacement, contact the Bose Aviation Headset Department. If the screen becomes wet or if foreign objects become lodged on or adjacent to it, proceed as described in General Care and Maintenance. Earcup TriPort maintenance Proper headset operation requires that the earcup TriPort openings be kept free of debris. The TriPort openings, shown in Figure 1, are located on the outside of each earcup and are comprised of two holes and a screen. Storage

Figure 1

Headset components
adjustable headband ear cushion wind screen batterypowered control module

protective inner screen

mounting clip

Earcup TriPort openings

flexible microphone boom aircraft installed control module

Headset description

The Bose Aviation Headset X comes in several variations for both general aviation and helicopter use. These variations are defined by the configuration of the attaching cable and the headsets power source.

Common features

Headsets have the following features (see Figure 1). Acoustic Noise Cancelling earcups An adjustable headband Replaceable ear cushions A flexible microphone boom with positional adjustment A replaceable wind screen A cable with an integrated control module A control module mounting clip (battery powered version) A cable-mounted clothing clip (installed version) A replaceable fleece headband cushion
Boom microphone cable variations
All boom microphone cables assemble into the headset as described in Preparing the Bose Aviation Headset X on page 11. Depending upon the headset configuration purchased, the boom microphone cable will be one of the types described in the Boom microphone cable variation table on page 10.
Introduction Boom microphone cable variation table
Note: You will need to verify the type of headset connection required by your aircraft communications panel before choosing a configuration from the table below.
Use Power Source Battery (9V) G E N E R A L A V I A T I O N Cable Type Straight Microphone Plug Controls

Electret

Standard headphone and microphone
ON/OFF switch Volume control Stereo/Mono switch LED power indicator

Aircraft (10-32V)

Straight
For aircraft panel connector
ON/OFF switch Volume control (dual thumb wheel)

Coiled

H E L I C O P T E R

Battery (9V)

ON/OFF switch Volume control LED power indicator

Dynamic low impedance

(10-32V) Aircraft
Preparing the Bose Aviation Headset X Preparing the Bose Aviation Headset X for use
Most Bose headsets are shipped with the boom microphone cable attached. Some headset configurations are shipped with the cable packed separately in the shipping container. All headset configurations allow the boom microphone cable to be attached to either earcup, at the users option.

Figure 2

Attaching the boom microphone cable

connector access cover

boom microphone cable
loosen screws several turns
Attaching or relocating the boom microphone cable
Detaching the boom microphone cable or connector access cover If necessary, remove the boom microphone cable or the connector access cover from the earcup as follows:
1. Loosen the two captive screws using a flat-tipped screwdriver (see Figure 2). 2. Pull the cable or the cover away from the earcup in a direction parallel to the screw axes. Note: Do not twist the boom microphone cable while disconnecting. Twisting can damage the connector pins. 11
Preparing the Bose Aviation Headset X
Attaching the boom microphone cable Attach the boom microphone cable to the earcup as follows:
1. Ensure that the cable connector and the mating earcup connector are clean and free of debris. 2. Retract the headset to its fully-closed position and ensure the earcups are together. 3. Place the cable into position. 4. Ensure that the cable connector is properly aligned with the earcup connector pins. If not aligned properly, damage may result. 5. Gently push the connector until it is fully engaged and the cable is seated against the earcup. Do not apply excessive force as earcup damage may result. 6. Ensure that the screw threads are properly started and tighten screws. 7. Rotate the microphone boom into the proper position. 8. Test headset operation before flight.
Attaching the connector access cover Attach the connector access cover to the earcup as follows:
1. Place the connector access cover into position. 2. Ensure that the screw threads are properly started and tighten screws.

Battery

If your headset is battery operated, install a fresh 9-volt alkaline battery into the control module, as described in General Care and Maintenance on page 26.

Warranty card

The Bose Aviation Headset X comes with a warranty card. Please supply the requested information to help Bose provide you with advisories and updates. Copy the serial number, located beneath the headband cushion, onto the warranty card and mail it to Bose. 12
Using the Bose Aviation Headset X

Wearing the headset

User comfort and good noise reduction performance require a proper fit. Note the left and right earcup markings and place the headset on the head as shown in Figure 3. Lightly grasp both earcups and position them so that your ears are completely inside the ear cushions and you feel even, gentle pressure around your ears. Adjust the headband to rest gently on top of your head. Final adjustment is best made in a noisy environment with the power switch set to ON. See Figures 5 and 6 for details. Experience using the headset helps establish a sense of how it should sound. When using the headset in very loud conditions, as during takeoff, you may experience brief reductions in ANR as the headset compensates for a momentary pressure change. If there is a problem, refer to Troubleshooting. If the problem persists, contact the Bose Aviation Headset Department for assistance.

Note: A low rumbling sound or frequent brief losses of ANR may indicate an improper fit or blocked earcup ports. See General Care and Maintenance.
If during a long flight you feel a slight pressure point, adjust the headband position to restore comfort.

Figure 3

Microphone placement
Clear communications depend on proper microphone placement. Follow these three steps for proper placement: 1. Identify the left and right earcups and put on the headset. 2. While holding the boom pivot in place, grasp the boom with your fingers and move the microphone housing to your mouth.
Note: Make sure the microphone is positioned with its label side closest to the mouth. Do not purse your lips. The microphone should sit slightly off center, but right at the opening of your mouth.
3. Once the microphone is in place, make sure the plastic housing with the printing is perpendicular to the lips. For clearest communications, make sure the microphone is as close as possible to your lips you should feel the windscreen brushing your lips as you speak.

Figure 4

Operating the battery powered headset

Power switch

Turn on active noise reduction by setting the power switch to ON. See Figure 5 for details.
Note: If you are connecting the headset to a newly installed aircraft powered system, remove the headset from your head before turning it on for the first time, in case of high-volume output.
Control module mounting clip
The control module mounting clip permits attachment to the users clothing, safety harness, or aircraft door pockets. Do not attempt to clip onto surfaces greater than 1/4-inch thick. You may attach a Velcro pad to the face of the clip for attachment to other surfaces.
Operating the battery powered headset (cont.)

Stereo/mono switch

The stereo/mono switch is provided only on the general aviation, battery powered headsets. The battery powered versions of the headset are shipped from the factory in the MONO setting. If your audio or intercom communications system is in stereo, be sure to set the switch to stereo (see A in Figure 5).

Figure 5

Battery powered control module: A. Stereo/mono switch B. ON/OFF switch C. Volume control D. LED power indicator

D To headset A C To communications/ audio panel

LED power indicator

The LED, located on the control module, indicates power status as follows: LED Color Green LED Illumination Blinking Indication Power ON or battery normal

Red/Green

Blinking
Battery low (less than 5 hours use remaining)
Power OFF or battery discharged
Control of the volume level of the Bose Aviation Headset X requires adjustments at both the aircraft intercom or radio and at the headset control module. Avoid setting the volume levels too high. Exposure to loud sounds may cause hearing damage.
Note: The headset volume control cannot completely turn off the volume.
The headset volume control is located on the control module, as shown in Figure 5. The volume at each earcup is controlled independently. Adjust the volume as follows: Push-in and release the knob. It will pop up from the control module. To increase the volume for the earcup with the boom microphone cable attached, rotate the knob clockwise. To increase the volume for the other earcup, gently pull-out the knob until you feel a click, and rotate the knob clockwise. To secure the earcup volumes at the selected levels, push-in the knob flush to the control module.
Volume control using multiple headsets
When an aircraft has more than one headset connected to its audio system, the pilot in command should adjust the volume of his/her Bose Aviation Headset X as follows: 1. Turn off active noise reduction by setting the power switch to OFF. 2. Set the volume on both earcups to maximum. 3. Adjust the aircraft intercom or radio master volume to hear communications clearly. This should be done in noise. Adjust the headset volume controls only to balance the volume between the left and right earcups. 4. Turn the headset ON. 5. Turn down the aircraft intercom or radio master volume to the desired listening level. 16
Operating the installed headset
Turn on active noise reduction by setting the power switch to ON. See Figure 6 for details. For volume control, follow the instructions in Volume control below.

Figure 6

1. Power switch 2. Volume controls
Control of the volume level of the Bose Aviation Headset X requires adjustments at both the aircraft intercom or radio and at the headset installed control module.
Note: Avoid setting the volume levels too high. Exposure to loud sounds may cause hearing damage. The headset volume control cannot completely turn off the volume.
Turn on the power switch located on the control module. Set the aircraft communication system to a safe operating level. Set the volume levels for the left and right earcups by rotating the thumb wheels as needed. Note: The microphone and cable assembly can be attached to either earcup. Thumb wheel #1 will always control the volume level of the earcup with the microphone and cable assembly attached. Thumb wheel #2 will always control the volume level of the earcup without the microphone and cable assembly attached.

Note: If you are connecting the headset to your aircraft for the first time, turn down the master output level of your radio/intercom system to avoid exposure to high volume levels.
Operating the installed headset (cont.)
When an aircraft has more than one headset connected to its audio system, the pilot in command should adjust the volume of his/her Bose Aviation Headset X as follows: 1. Turn off active noise reduction by setting the power switch to OFF. 2. Set the volume on both earcups to maximum. 3. Adjust the aircraft intercom or radio master volume to hear communications clearly. This should be done in noise. Adjust the headset volume controls only to balance the volume between the left and right earcups. 4. Turn the headset ON. 5. Turn down the aircraft intercom or radio master volume to the desired listening level. After the pilots headset volume is adjusted, passengers may adjust their headset volume to the preferred level.
The control module mounting clip permits attachment to the users clothing, safety harness, or aircraft door pockets. Do not attempt to clip onto surfaces greater than 1/4-inch thick.

Aircraft panel connector

For permanent installation of the headset, the cable is installed into the aircraft. A connector and 6-foot wiring harness are packaged with the headset. The 6-foot wiring harness is a self-latching, precision designed, quick-connector for panel mounting in the aircraft. The connector is mechanically keyed to ensure proper mating. Additional connectors and wiring harnesses are available from Bose. To order, call the Bose Aviation Headset Department.
Note: The aircraft panel connector must be mounted by mechanics qualified to perform this type of avionics installation into the aircraft being used.
Installing the aircraft panel connector
Mount the connector into a cutout, as shown in Figure 7. Connect the eight wires as follows: Two for the microphone Two for audio One for power One for ground Two for audio shields Audio and microphone wires should be connected to the back of the existing microphone and headphone jacks, leaving existing jacks intact for use with conventional headsets. This is usually the fastest installation method (see Figures for reference).

Figure 7

Connector technical information

PANEL HOLE REQUIRED

12.6mm.5"

14.1mm.56"

RECEPTACLE - PINOUT (FRONT VIEW)

PIN 1 PIN 6

AIRCRAFT INTERFACE SCHEMATIC
RED BLK WHT BLK WHT WH/BLU BLK BLK

1 V+IN 2 GND 3 COMM L 4 COMM R 5 MIC HI 6 MIC LO
The pinout for the optional installed connector is: Pin 5 Wire Color Red Black White Black White Description Headset power (10-32 VDC). Use a 1/4-amp fuse or a 1/ -amp circuit breaker. 2 System ground. Connect to the existing audio ground. Phone communication-L Phone communication-R Microphone/Hi-audio. Connect to the portion of the existing microphone jack that corresponds to the ring position of a headset microphone plug. Do not connect to the tip (PTT) segment. Microphone/Lo-ground. Connect to the portion of the microphone jack that corresponds to the barrel position of a headset microphone plug. Shield from Comm 1 and Comm 2 wire pair Shield from Mic Hi and Mic Lo wire pair

White/Blue

Comm Shield Mic Shield Notes

Black Black

For use with a stereo intercom, connect the left and right channels to their respective positions. For monaural operation, connect pins 3 & 4 together to the tip of the existing phone jack. Do not use excessive force or bend the installed connector. This may damage or break internal solder joints. If the boom microphone works on radio transmit but not through the intercom, check pin 6. It may be incorrectly wired to the PTT segment of the microphone jack. The wires connecting pins 3 & 4 and pins 5 & 6 are shielded, twisted pairs with a shield termination exiting with a black wire for each pair. Connect shields to existing audio wiring shields or to audio ground, if existing wiring is not shielded. 20 Connect shield from Comm L and Comm R wire pair to audio ground.
The Bose aircraft panel connector cannot be installed to an audio system using transformer-coupled audio outputs. Call the Bose Aviation Headset Department for details. Adhesives approved for use with this connector are: Ciba-Geigy Uralane 5754-A/B Lord 710 VTCS-6 Vibratite Do not let cyanoacrylate-based adhesives, flux remover, or other caustic compounds contact the connector body. These chemicals cause irreparable damage to the connector. For information on chemical compatibility and connector part number, call LEMO USA, Santa Rosa, CA at 1-800-444-5366.

Figure 8

Mono installation of the headset
10-32 V DC.5 RED BLK WHT BLK WHT WHT/BLU 1 V+IN 2 GND 3 COMM L 4 COMM R 5 MIC HI 6 MIC LO
Ring (audio) Microphone - Jack TPP (PTT) Existing wiring to aircraft intercom/ audio panel. Tip (phone audio) Barrel (gnd) Existing PTT switch and wiring (no connection to Bose headset)
Headphone - Jack Barrel (audio gnd)

Figure 9

Installation to existing aircraft stereo jacks
10-32 V DC.5A RED BLK WHT BLK BLK WHT WHT/BLU
Audio Microphone - Jack TIP (PTT) Existing wiring to aircraft stereo intercom/audio panel. Barrel (gnd) Existing PTT switch and wiring (no connection to Bose headset)

Phone audio(right) Stereo Headphone - Jack Tip (phone audio left) Barrel (audio gnd)

Figure 10

Installation to existing helicopter single jack

10-32 V DC.5

6 MIC LO 5 MIC HI 4 COMM R 3 COMM L 2 GND 1 V+IN
Existing single 4prong jack Existing wiring to helicopter intercom audio panel. Barrel (audio gnd)
General Care and Maintenance
Instructions for continued airworthiness
Bose recommends following the General Care and Maintenance instructions in this guide. With normal use, items such as windscreens and ear cushions may require periodic replacement. If cleaning or replacement of these items is needed, follow the recommendations on the following pages. All other care and maintenance in and out of the warranty period must be performed by Bose or an authorized dealer. Other maintenance is performed by condition only.
CAUTION: Do not immerse the headset in water or any other liquid.

Cleaning instructions

General cleaning Gently wipe the outside surfaces of the headband, connectors, plastic parts, and headband cushion, using a soft cloth moistened with water and mild soap. Take special care when cleaning the ear cushions and the outside surfaces of the earcups, as described below. Earcup TriPort openings The earcup TriPort openings, shown in Figure 7, must remain clean and free of debris. Ensure that ports are clean before each flight. When wiping down the headset, be sure not to force any dirt or debris into the ports. Carefully use tweezers, if necessary, to remove foreign matter that may be lodged in the ports. Do not blow air into or vacuum the ports. Ear cushions
To extend the life of the ear cushions, wipe them clean in the manner described in General cleaning above. Regular cleaning of the earcushions is recommended. It is also recommended that you replace the earcushions annually. If, however, more vigorous cleaning is required, remove the ear cushions from the earcups, as shown later in this section, to ensure that the protective inner screen is not damaged during the cleaning process. Do not immerse ear cushions in water or any other liquid.

General Care and Maintenance Cleaning instructions (cont.)

Wind screen

Remove the wind screen from the microphone as described in Replacing the wind screen on page 26. Wash the wind screen by immersing in mild soapy water. Rinse, air-dry, and reattach the wind screen.
Protective inner screen The inner screen, shown in Figure 11, is critical to proper headset operation. Do not attempt to remove, replace, repair, or clean this component. If operating problems develop, contact the Bose Aviation Headset Department. Headband cushion To clean the headband cushion, follow these steps:
1. Remove the cushion as described in on page 27. 2. Place the cushion in a solution of water and a mild detergent such as Woolite. 3. Allow the cushion to air dry. Then, reattach by following the instructions on page 27.
Removing environmental moisture If the protective inner screen becomes dampened by environmental moisture such as light rain, dew, perspiration, or condensation, remove the moisture by air-drying only. Do not use electric heaters, blowers, or hair-dryer type devices to dry the inner screen. If the headset is immersed in liquid, do not use it. Contact the Bose Aviation Headset Department for assistance.
General Care and Maintenance Replacing the ear cushion
Replace the ear cushion as follows. See Figure 11: 1. Grasp the ear cushion skirt where it folds into the slot on the earcup. 2. Gently pull the ear cushion skirt up and away from the earcup. 3. Properly position the replacement ear cushion against the earcup. 4. Tuck an edge of the ear cushion skirt into the slot behind the ear cushion flange. Do not fold the skirt over. 5. Work the remainder of the skirt into the slot completely around the earcup. 6. Grasp the ear cushion and adjust its position to remove any folds in the skirt and wrinkles in the cushion.

Figure 11

Replacing the ear cushion

Protective inner screen

General Care and Maintenance Replacing the wind screen
Replace the wind screen as follows (see Figure 12): 1. Remove the attaching band by rolling away from the tip of the microphone. 2. Gently pull the wind screen from the microphone. 3. Remove the attaching band. Cut the band with small clippers if necessary. 4. Slide-on the replacement wind screen and ensure that it fits securely over the microphone. 5. Roll a new attaching band over the installed windscreen to the proper position.

Figure 12

Replacing the wind screen

Replacing the battery

Replace the battery as follows (see Figure 13): 1. Turn the ON/OFF switch to OFF. 2. Slide the battery cover away from the control module, using the finger indent. 3. Remove the old battery. 4. Ensure that both the battery and the receptacle contacts are clean. 5. Install a 9V alkaline battery. (The control module is mechanically keyed to ensure proper polarity at installation.) 6. Replace the battery cover.

Figure 13

finger indent
General Care and Maintenance Replacing the headband cushion
The headband cushion is designed to give the maximum level of comfort to your headset. Please follow the maintenance instructions below for regular care. Bose recommends that the cushion be replaced after regular care and maintenance fails to restore the wool pile to its original size and shape. If necessary, replace the headband cushion as outlined below. See Figure 14 for details. 1. Turn the headset over and open the headband so the cushion is flat. 2. Grasp the edge of the cushion and remove it from the Velcro seating. 3. Align the center of the new cushion with the center of the headband and press firmly to attach.

Figure 14

Remove and replace the headband cushion
Replacing the boom microphone cable or connector access cover
Replace the boom microphone cable or connector access cover as described in Preparing the Bose Aviation Headset X on page 11. 27

Troubleshooting

In case of difficulty
Identify the problem in the left column of the table. Perform the corrective actions suggested in the right column. If the problem persists, contact the Bose Aviation Headset Department, using the contact information on page 33 of this guide, for assistance.

Problem

Communication but no active noise reduction in either ear

What to do

Ensure that the headset is powered, and that the ON/OFF switch is set to ON. If using aircraft power, check the aircraft fuse or circuit breaker. The LED should be lit. If using battery power, ensure that the battery is fresh and correctly installed. Check that the LED is lit. (A blinking green LED indicates a good battery. A steady red LED indicates a low battery.)
Active noise reduction but no communication or very low volume communication in both ears
Check to see if the volume controls are set too low. (See Volume Control for method of adjusting volume.) Check the volume setting of intercom/radio. Check the headset aircraft connection. Check the ports at the outside surface of each earcup to ensure they are not blocked. If dust or dirt is present, carefully remove the debris using tweezers. Do not vacuum or blow out debris.
Reduced active noise reduc- tion, intermittent clicking sounds, or communication distortion in a loud environment Reduced volume in one ear only Stereo missing or communications in one ear only

Check to see if the volume control is set too low. (See Volume Control for method of adjusting volume.) If using with a monaural aircraft audio system, verify that the stereo/mono switch is set to mono. If plugged into a monaural system with the switch set to stereo, you will hear only through the earcup to which the cable is attached. Set the switch to mono. Check to see if the protective inner screen is damaged.
Squealing, whistling, or chirping sound when the system is turned on 28
Low rumbling sound with headset turned on in a quiet environment
Adjust the earcup fit to create a better seal on the head. The headsets low-force design makes it sensitive to items that interfere with the seal around the ear. Ensure that the ears are completely inside the ear cushions and that items such as a hat or eyeglasses with thick temples do not interfere with the seal. Check ports at the outside surface of each earcup to ensure they are not blocked. If dust or dirt is present, carefully remove the debris using tweezers. Do not blow out or vacuum debris. Inspect the seal between the ear cushion skirt and the earcup. The skirt should enclose the earcup evenly, without gaps. If the ear cushion has surface tears, torn stitching joints, large wrinkles, or a surface which has become dried and stiff, replace the ear cushions. Adjust the earcup fit to eliminate the sound. See Wearing the Headset. If battery powered, check to see if the battery is low, red light is on. If aircraft powered, check that the voltage powering the headset is greater than 10 VDC. Inspect the seal between the ear cushion skirt and the earcup. The skirt should fit into the slot on the earcup, without gaps. If the ear cushion has surface tears, torn stitching joints, large wrinkles, or a surface which has become dried and stiff, replace the ear cushions. Check boom microphone cable connection on the bottom of the earcup.
Crackling sound audible with headset turned on in a loud environment, or ANR is intermittent.
No active noise reduction and no communication
Do not attempt to disassemble or service the inside of the earcups or other parts of the headset. Only the boom microphone cable, connector access cover, battery, battery cover, wind screen, and ear cushions, are replaceable by the user. For instructions on how to care for the headset and how to replace the ear cushions, refer to General Care and Maintenance. 29

Technical Information

Sound pressure levels (SPL) are relative to 20 micropascals.

Headphone

Damage could occur to avionics equipment that is intended for use only with 600-ohm headsets. If in doubt, consult the avionics equipment manufacturer. Monaural mode: 160 ohms (ON) and 230 ohms (OFF) at 1 kHz Stereo mode: 320 ohms (ON), 460 ohms (OFF) 15 Hz to 15 kHz Sensitivity: 90 dB SPL typical, measured at 1mw, 1kHz, full volume on KEMAR ear simulator Bias required: 8 to 16 VDC through 220 to 2200 ohms Sensitivity: Varies depending upon bias and radio AC input impedance. Typical output is 300 mV at 114 dB SPL. To assure proper modulation of the radio, it is recommended that an avionics technician adjust its input to match the output of the microphone. Impedance: 5 ohms Sensitivity: Equivalent to M-87/M-dB SPL Battery powered: 9-volt alkaline Aircraft powered: 10 to 32 VDC Alkaline: Up to 20 hours in typical aircraft noise (decreases at cold temperatures) Operating: 25 ma in typical aircraft noise

Impedance Frequency response

Microphone (Electret)

Microphone (Dynamic) Maximum ambient noise level Voltage Battery life Current Fuse/ breaker recommended Headset weight Headset size range Temperature and Altitude (Category A)
/4-amp, fast-blow fuse (AGC 1/4 fuse) or 1/2-amp circuit breaker
12 ounces (340 grams) on the head when cable is supported by the mounting clip Breadth: 4.8 to 6.3 inches Height: 4.5 to 5.7 inches Operating: 5 to 131F (-15 to 55C) Storage: -67 to 158F (-55 to 70C) Altitude: 15,000 feet maximum pressure altitude for full cancellation
Technical Information FAA Technical Standards Order
The Bose Aviation Headset X, its interface, cables, and electret boom microphone are FAA approved to TSO C57a and C58a. It has been designed to function in or withstand exposure to the following environmental conditions: Environmental categories cited refer to RTCA/DO-160C, December 4, 1989 and DO-214, March 4, 1993. Condition AF Conducted Susceptibility Humidity Magnetic Effect Power Input RF Susceptibility Temperature & Altitude Vibration Voltage Spike Shock Drop B Z B T A1 P&S A 12 times, 1 m onto concrete Category B
Service & Warranty Information
Ordering spares and accessories
The following accessories and customer replaceable components may be purchased directly from Bose: Cable for general aviation and helicopters, as described in the boom microphone cable variation table Ear cushions Carry bag Wind screen with attachment band Aircraft panel connector installation kit Battery cover Fleece headband cushion Contact the Bose Aviation Headset Department for ordering information.

Warranty period

Limited two-year warranty: Bose Corporation warrants this headset to be free from defects in materials and workmanship for a period of two years from the date of purchase. Ear cushion life will vary with use. Ear cushions carry a six-month limited warranty against manufacturers defects.

Service

Contact the Bose Aviation Headset Department for: Spare parts and accessories Technical advice Installation information Warranty and repair information To return your headset to Bose: 1. If the headset is being returned during a Bose thirty-day trial period, request a return authorization number from the Bose Aviation Headset Department. Clearly mark the return authorization number on the outside of the package. 2. Enclose your name, address, daytime telephone number, and description of the problem, if any. 3. Securely pack the headset. 4. We recommend you insure the headset. 5. Send it to this address:

Bose Aviation Headset Series II

Owner's Guide

Operational Advisories
As with any complex electronic device, it is possible for this headset to experience a failure during operation. Such a failure may include loud tones, distortion and loss of communications signal in the headset when used in the active or on position. The system is on when the rocker switch is up.
Note: This failure could prevent continued use of the headset in the on position.
These loud tones and the related loss of communications can be eliminated for the duration of the flight simply by switching the headset off. (The system is off when the rocker switch is down.) With the switch off, the headset continues to function in the passive mode, maintaining full communication capabilities. We strongly recommend that as a responsible pilot, you ensure you can hear and recognize typical aircraft sounds while you are using the headset. Limit the volume of your headset to safe levels so it does not interfere with your ability to hear informational sounds, such as those emitted by warning alarms; i.e., stall warning, gear up. Avoid setting the volume controls at high levels that may affect your hearing during extended periods of headset use. The Bose Aviation Headset Series II has been tested and found to comply with limits for a class B digital device, pursuant to part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: Reorient or relocate the receiving antenna. Increase the separation between the equipment and the receiver. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Consult the dealer or an experienced radio/television technician for help. This apparatus does not exceed the class B limits for radio noise emissions from digital apparatus set out in the Radio Interference Regulations of the Canadian Department of Communications. It also complies with Canadian ICES-003 Class B.
This headset meets or exceeds all requirements of EN352-4, 1996 (European Standard-Hearing Protectors-Safety Requirements and Testing-Part 4: Level-Dependent Ear Muffs). The wearer should ensure that: i. ii. iii. The ear muffs are fitted, adjusted, and maintained in accordance with the manufacturers instructions. The ear muffs are worn at all times in noisy surroundings. The ear muffs are regularly inspected for serviceability.
WARNING: If the above recommendations are not adhered to, the protection afforded by the ear muffs will be severely impaired.

This product may be adversely affected by certain chemical substances. Further information can be sought from the manufacturer. Ear muffs, and in particular cushions, may deteriorate with use and should be examined at frequent intervals for cracking and punctures, for example. EN352-4 also calls for HML Criterion Levels and other data to be provided to describe the hearing protection performance of leveldependent devices. At present, no standard has been drafted or accepted defining how to measure the hearing protection provided by active noise cancelling headphones. In the absence of an accepted method, Bose Corporation has had the products attenuation measured by an accredited U.S. testing laboratory using a combination of real head methods. Based on this information, the Bose Aviation Headset Series II provides sufficient hearing protection in any noise up to 108 dB(A) in sound pressure level. For more information on the methods used and the results obtained, please contact the Bose Aviation Headset Service Department (page 23). This headset complies with RTCA/DO-214 Audio Systems Characteristics and Minimum Operational Performance Standards for Aircraft Audio Systems and Equipment: Transient RF Susceptibility per RTCA/DO-214 2.5.11.1 and RTCA/ DO-160C 20.0, Category T. Sustained RF Susceptibility per RTCA/DO-214 2.5.11.2 and RTCA/DO-160C 20.0, Category T.
Declaration of Conformity
We, the offerer: Bose Corporation, The Mountain, Framingham, MA 01701-9168 USA acknowledge our sole responsibility, that the product: Kind of equipment: Type designation: Headset Bose Aviation Headset Series II
in accordance with EMC Directive 89/336/EEC and Article 10(1) of the Directive, is in compliance with the following norms: Technical regulations: Electromagnetic Compatibility Emissions Electromagnetic Compatibility Susceptibility
EN55011, EN55013, EN55022 EN50082-1, EN55020
Accredited by Bose Corporation
14 March 1997 Bose B.V. Nijverheidstraat 8,1135 GE Edam The Netherlands Anton Schalkamp General Manager, Bose Europe Manufacturers authorized EU representative

Contents

Operational Advisories.. 2 Introduction.... 6 Description... 6 Warranty card.. 6 Using the Bose Aviation Headset.. 7 For proper headset fit.. 7 Interconnect plug... 8 Microphone placement.. 8 Adjusting the volume... 9 Fail-resistant operation... 9 Microphone boom relocation... 10 Headset cable relocation.. 11 Powering the headset.. 12 Portable battery pack... 12 Installed connector.. 15 Installed DC power connector.. 17 Care and Maintenance... 18 Cleaning instructions.. 18 Clear ComfortTM cushion replacement and maintenance.. 18 In Case of Difficulty... 20 Technical Information.. 21 Service and Warranty Information... 23

Introduction

Description
Congratulations on your purchase of the Bose Aviation Headset Series II. This headset uses an advanced combination of electro-acoustical noise reduction circuitry and a patented cushioning system to significantly reduce aircraft noise. It actively reduces noise elements in addition to muffling noise. The patented Clear ComfortTM cushions require only slight pressure to provide high passive noise attenuation. As a result, this headset can be worn comfortably for extended periods. The headset may be powered in one of two ways: a portable battery pack, or a connector installed into your aircraft. ATTENTION: With the headsets combination of both active and passive attenuation, typical aircraft sounds (for example, those from engines, propellers, warning alarms, and other sound sources) may sound different to you. We strongly recommend that you ensure you can hear and recognize these sounds while you are using the Bose aviation headset while operating any aircraft. In addition, should you choose to listen to in-flight entertainment through a Bose headset while piloting, we remind you to limit the volume to safe levels so that it does not interfere with your ability to hear informational sounds, such as those emitted by warning alarms.

Warranty card

1. Remove the headband cushion by pulling it away from the hook and loop fastener. 2. Copy the serial number from the white label onto the warranty card. 3. Complete the warranty card and mail it to Bose.
Using the Bose Aviation Headset

For proper headset fit

Note: The headset must be worn with the Bose logo (located on the earcups) facing forward.
To achieve comfort and good performance, adjust both sides of the headband equally to provide a comfortable fit. To achieve a good seal, lightly grasp both earcups and position them so that your ears are completely inside the Clear ComfortTM cushions.

Figure 1

Adjusting the headset
Note: If you hear a hiss or a low rumbling sound, this may indicate an improper fit. Extending the headband slightly should correct this condition. Wearing glasses with thick temples or a hat may interfere with the fit and cause a problem.
Final adjustment is best accomplished in a noisy environment with the headset system turned on. Then, reposition both earcups until the headset seems quietest.

Interconnect plug

The headset interconnect plug connects the headset cable to a power source. The power source can be an installed connector in the aircrafts control panel or an adapter cable connected to a portable battery pack. The interconnect plug is designed for quick connection and removal. To ensure correct pin alignment, the plug has a keyway.

Note: The illustrations below show the insertion of the headset interconnect plug into the adapter cable. To insert the interconnect plug into the aircraft control panel, the same procedure would be used.
To insert: rotate the plug until the keyway is aligned; then insert until it locks in place.

Figure 2

Inserting the headset interconnect plug into the keyway
To remove: gently pull back on the sleeve of the connector. This automatically unlocks the plug from the socket.

Figure 3

Pulling back on the sleeve to remove the interconnect plug

Microphone placement

For good communication clarity and noise rejection, locate the microphone housing so that it just brushes your lips.

Figure 4

Placing the microphone

Adjusting the volume

The volume for your headset is controlled by the grooved knobs located on the front side of the headband arms. Avoid setting your volume controls at high levels that may affect your hearing during extended periods of headset use.
Note: The volume controls and the active noise reducing circuitry work only when the headset is turned on (Figure 6). Note: The volume cannot be turned off completely.

Figure 5

Figure 6
Turning the headset ON/OFF

ON OFF

Fail-resistant operation
The headset provides communication and the earcups block some noise even with the power switch on your headset turned off, bypassing all active noise reducing electronics. Turn the headset off if you suspect there may be a problem; for more information, refer to In Case of Difficulty (page 20).
Microphone boom relocation
To suit your flying preference, the headset boom can easily be moved from one earcup to the other. 1. Unscrew the retaining knob on the boom mic mount. 2. Unplug the mic cable from the headband arm.

Figure 7

Unplugging the mic cable
3. Find the crescent-shaped flanges on the top and bottom of the booms attachment clip (Figure 8). The clip fits snugly on the earcup when the flanges face the earcups outer side. Make sure the arc of the boom curves in front of the headset. Attach the clip to the headset by tightening the attachment knob until the clip is secure.

Note: The view shown is for the left earcup. To install on the right earcup, turn the clip-and-boom assembly over.

Figure 8

Relocating the mic boom
4. Plug the mic cable into the headband arm. You may want to use the adjustment screw to tighten the tension of the clip on the boom mic. The adjustment screw is on the flat end of the clip. Use a 332 in. hex wrench to tighten it. Do not over-tighten. Experience in using the headset helps establish your sense of how it should sound. If you notice a problem, refer to In Case of Difficulty (page 20). If problems persist, contact the Bose Aviation Headset Service Department to arrange for service (page 23).

Headset cable relocation

Powering the headset
The Bose Aviation Headset Series II may be powered in one of two ways: a portable battery pack, or a connector installed into the aircrafts instrument panel.

Portable battery pack

The portable battery pack is available in two versions: NICAD rechargeable and alkaline.
The NICAD rechargeable battery pack: Operates for 12-16 hours
Recharges in 90 minutes (maximum)
CAUTION: Be sure to use the correct charger (Bose model numbers BC-QC120 for 120V or BC-QC230 for 230V). Using the wrong charger may damage your charger or battery pack.
The alkaline battery pack: Operates for approximately 40 hours
Holds 6 AA alkaline batteries
Charging the NICAD battery pack

Click Click

Note: Completion of the charging cycle is indicated by the flashing light on the charger. The battery will not be damaged if left connected to the charger.
Using the Bose Aviation Headset Inserting batteries into the alkaline battery pack
Spin the batteries once with thumb to seat them securely.
Using the Bose Aviation Headset Installed connector
An optional installed connector is available for pilots who want to hardwire the DC power, incoming audio, and outgoing microphone functions permanently into their plane. The panel mount receptacle comes wired with a 6 foot harness to simplify the installation process. To order this connector, contact the Bose Aviation Headset Service Department (page 23). The Bose Aviation Headset Series II uses a self-latching, precision designed quick connector. A mechanical keying system ensures greater ease in mating.
Installing the wire harness
Note: This installation must be done by mechanics qualified to perform this type of avionics installation for the aircraft in which the installed connector will be used.
A.5 in. x.56 in. (1.27 cm x 1.42 cm) cutout is required to mount the connector as shown in Figure 9. There are 6 wires to connect: 2 for microphone, 2 for audio, 1 for power, and 1 for ground. The audio and microphone wires should be connected to the back of the existing microphone and phone jacks. This leaves the existing jacks intact for use with conventional headsets and is usually the fastest installation method. The pinout for the optional installed connector is as follows: Pin Wire 5 Red Description Headset power (7-32 Volts DC). Use a.5 amp fuse or circuit breaker. Black System ground. Connect to the existing audio ground. White Phone communication-left. Black Phone communication-right. White Mic/Hi-audio. Connect to the existing portion of the mic jack that corresponds to the ring position of a headset microphone plug. Do not connect to the tip (PTT) segment. White/Blue Mic/Lo-ground. Connect to the existing portion of the mic jack that corresponds to the barrel position of a headset microphone plug.

Notes:

1. If used with a stereo intercom, connect the left and right channels to their respective positions. For mono operation, connect Pins 3 & 4 together to the tip portion of the existing phone jack. 2. Do not bend or use excessive force on the installed connector. Doing so may damage or break the internal solder joints. 3. If the boom mic works on radio transmit but not through the intercom, check Pin 6. It is probably miswired to the PTT segment of the mic jack. 4. The wire connecting Pins 3 & 4 and 5 & 6 are shielded, twisted pair with a shield termination exiting with a black wire for each pair. Connect shields to existing audio wiring shields, or audio ground if the existing wiring is not shielded.
5. Approved adhesives for use with this connector are Ciba-Geigy Uralane 5754A/B, Lord 710, or VTCS-6 Vibratite. Do not let any cyanoacrylate-based adhesives (e.g., Loctite), flux remover, or other caustic compounds come into contact with the installed connector body. These chemicals will cause deterioration and/or irreparable damage to the connector. For information on chemical compatibility and connector part number, contact LEMO USA, Santa Rosa, CA at 1-800-444-5366.

PANEL HOLE REQUIRED

Figure 9
Connector technical information

12.6mm.5"

14.1mm.56"
RECEPTACLE - PINOUT (FRONT VIEW)

PIN 1 PIN 6

AIRCRAFT INTERFACE SCHEMATIC
RED BLK WHT BLK WHT WH/BLU BLK BLK
1 V+IN 2 GND 3 COMM L 4 COMM R 5 MIC HI 6 MIC LO
Using the Bose Aviation Headset Installed DC power connector
An optional installed connector is available for pilots who want to use their planes DC power, instead of the battery pack, with the portable adapter cable. The connectors small size allows it to be installed in a convenient location in the control panel, for example, near the headphone and mic jacks.
Installing the DC power connector Note: This installation must be done by mechanics qualified to perform this type of avionics installation for the aircraft in which the installed connector will be used.
1. Install the wires from the DC power connector into the plane. The pinout for the connector is as follows: Pin Wire Red Black Description Headset power (7-32 Volts DC). Use a.5 amp fuse or circuit breaker. System ground. Connect to the existing audio ground.
2. Plug the headset adapter power plug into the connector.

Figure 10

Inserting headset plug into the connector
3. Insert the headphone and microphone plugs into their receptacles in the aircrafts control panel.

Figure 11

Location of headphone and microphone receptacles in a typical planes control panel

Care and Maintenance

Cleaning instructions
Clean the headset exterior and cushions by wiping them with a moist cloth. Mild soap may be used.
CAUTION: Do not immerse the headset in water.
The headband cover is made from leather and sheepskin. If it becomes soiled, it may be removed and cleaned using mild soap. To remove the headband cover, peel apart the hook and loop fastener along the flap.
Clear Comfort cushion replacement and maintenance
To maintain good noise reduction, the Clear Comfort cushions in the headset should be replaced periodically; annual replacement is recommended. As the cushions wear, the silicone gel rings may spread apart, causing uneven thicknesses and gaps in coverage. This can lead to air leaks that result in reduced noise attenuation. Popping or fluttering sounds are also common when wearing worn cushions. If the gel leaks, replace the cushion. Frequent flying may require replacement more often. To order a replacement cushion kit, call the Bose Aviation Headset Service Department (page 23). Before ordering, remove the cushions and inspect the foam liners in the earcups. If you note significant deterioration, order foam liner replacements also.
To remove the cushion and foam liner Note: Do not use a hard object such as a screwdriver, which can mar the earcup.
1. Unsnap the trim ring on one earcup by gently prying the edge loose with your fingers.

Figure 12

Unsnapping the trim ring from the earcup
Once the trim ring has popped loose, work your way around the earcups until the trim ring is completely free. 2. Lift out the old cushion. If you will be installing a new foam liner, proceed to the next section. Otherwise, skip to To replace the cushion (page 19).
Care and Maintenance To install a new foam liner
Note: The left and right foam liners are different.
1. Lift the old foam liner out of the earcup. 2. Place the new foam liner in the earcup. With the correct foam liner in place, nesting along the walls of the cavity, its half-moon shaped opening should cover the microphone, and the small opening in the foam liner should fit over the small hole.

To clean the cushion

Using a baby wipe or a cloth moistened with isopropyl alcohol, gently wipe the side of the cushion that touches the ear. Let the cushion air dry.

To replace the cushion

1. Place the holes in the new cushion onto the posts on the earcup.

Figure 13

Placing the new cushion onto the earcup
2. Align the cushion/trim ring, with its flat edge forward, to the earcup.

Figure 14

Alignment of earcup, foam liner, cushion, and trim ring
Note: If both old cushions have been removed, note that there are left and right trim rings. The left ring will not fit on the right earcup.
3. Snap the trim ring down firmly along its entire circumference.
Note: Make sure that the trim ring is not grabbing or pinching the side of the cushion at any spot. If it is, remove the trim ring and reattach the cushion, being sure the cushion skin is not pinched.
4. Replace the foam liner and cushion on the other earcup in the same manner.
In Case of Difficulty Problem
Communication but no active noise reduction in both ears.

What to do

Make sure that your headset is powered, and that the power switch is ON. If using DC power from the aircraft, check the aircraft fuse or breaker. If using the NICAD battery pack, verify that it is charged. If using the alkaline battery pack, verify that: batteries are installed with the correct polarity. The negative terminal of each battery attaches to the springs in the battery holder (refer to step 4 on page 13). batteries are fully seated and in contact with the top and bottom contacts of the battery holder. If necessary, spin the installed batteries once with your thumbs to fully seat them (refer to step 5 on page 13). batteries are fresh. the headset plug is fully seated in battery pack (refer to step 11 on page 14).
Active noise reduction but no (or very low volume) communication in both ears. Reduced active noise reduction, intermittent clicking sounds, or communication distortion in a loud environment. Low rumbling sound with the headset turned on in a quiet environment.
Check to see if the volume controls are turned too low (rotate up to increase the volume).
Check the holes at the bottom of each earcup to make sure they are not blocked. If dust or dirt has built up here, carefully use a small wire or the end of a bent paper clip to unclog the hole. You may need to remove the microphone to clean the holes. Adjust the earcup fit to create a better seal to your head. Be sure that a hat or eyeglasses do not interfere with the seal. Inspect the seal between the cushion and the earcup. The cushion should sit on the earcup evenly, without gaps. Check the holes at the bottom of each earcup to make sure they are not blocked. If dust or dirt has built up here, carefully use a small wire or the end of a paper clip to unclog the hole. You may need to remove the microphone to clean the holes. Adjust the earcup fit to eliminate the sound. Inspect the seal between the cushion and the earcup. The cushion should sit on the earcup evenly, without gaps. Check to see if the ear cavity foam liner is missing or severely damaged. If so, refer to Care and Maintenance (page 18). Do not attempt to disassemble or service the inside of the earcups or other parts of the headset. Only the microphone boom assembly, Clear ComfortTM cushions, trim rings, foam liners, headband cover, and foam pad are designed for replacement by the user. For instructions on how to care for your headset and how to replace the cushions, refer to Care and Maintenance (page 18). If problems persist, contact the Bose Aviation Headset Service Department (page 23).

Popping sound audible with headset turned on in a loud environment. Squealing, whistling, or chirping sound when the system is turned on.

Technical Information

Sound pressure levels (SPL) are relative to 20 micro Pascal. Earphones Damage could occur to avionics equipment if it was manufactured for use only with 600 (ohm) headsets. If in doubt, consult the avionics equipment manufacturer. Impedance In mono mode: 480 (on) and 190 (off) at 1kHz. In stereo mode: left, 500 (on), 190 (off); right, 2000 (on), 190 (off). Frequency response 20Hz - 15kHz Sensitivity 90dB SPL measured at 1mW, 1kHz, full volume on flat plate coupler Microphone Bias Required: 8 to 16VDC through 220 to 2200 Sensitivity: Depends upon bias and radio AC input impedance. Typical output is 300mV at 114dB SPL. To assure proper modulation of your radio, it is recommended that you have your avionics technician adjust its input to match the output of your headsets microphone. Active noise reduction Active Noise Reduction Bandwidth: 30Hz - 700Hz Noise floor 28dBA SPL (typical) Maximum ambient noise level Approximately 118dB SPL at full cancellation Voltage 7-32VDC Current 60mA typical, 120mA maximum operating Fuse/breaker recommended
/2 amp fast blow (AGC 1/2 fuse)
Headset Weight 22 oz. (567 grams) Temperature and Altitude (Category A1) Operating Temperature: +5 to +131 F (-15 to +55 C) Storage Temperature: -67 to +158 F (-55 to +70 C) Altitude: 15,000 ft. maximum pressure altitude for full cancellation
The Bose Aviation Headset Series II headset, adapter cables, battery packs, and boom microphone are FAA approved to TSO c-57a and c-58a.
The Bose Aviation Headset Series II has been designed to function in or withstand exposure to the following environmental conditions. Environmental categories cited refer to RTCA/DO-160C, 4 Dec 1989 and DO-214, 4 Mar 1993. Condition AF Conducted Susceptibility Humidity Magnetic Effect Power Input RF Susceptibility Vibration Voltage Spike Shock drop.12 times, 1 meter onto concrete Category B B Z B T P&S A
Service and Warranty Information

Service

Bose Aviation Headset Service Department 145 Pennsylvania Avenue Framingham, MA 01701-9168 U.S.A. TEL: FAX: 1-800-233-4416 (U.S.) 1-508-879-7330, ext. 62006 (outside U.S.) 1-508-820-3465
Contact the Bose Aviation Headset Service Department for: accessories. technical advice. installation information. warranty and repair information.
If your headset must be returned for service: 1. Request a return authorization number from the Bose Aviation Headset Service Department (see above).

2. Securely pack the headset, enclosing your name, address, daytime telephone number, and a description of the problem. 3. Clearly mark the outside of the package with your return authorization number, insure your headset, and send it to the address above.

Warranty period

Limited Two-Year Warranty: Bose Corporation (Bose) warrants this product to be free from defects in material and workmanship for a period of two years from the date of purchase. The ear cushions are not included in this warranty; annual replacement of cushions is recommended. See Care and Maintenance (page 18).
Limited warranty Bose product

What is covered

All parts defective in material or workmanship.

For how long

At least one year from the purchase date, or longer if specified in your owners manual, but not longer than five years from the purchase date.

What we will do

We will, at our sole option, repair or replace any defective parts free of charge.

What we will not do

Pay shipping or transportation charges from you to us.

What you must do

1. Return product personally with proof of purchase from an authorized Bose dealer to your authorized Bose dealer, or 2. Return product personally with proof of purchase from an authorized Bose dealer to the nearest Bose Service Agency, or 3. Return product personally with proof of purchase from an authorized Bose dealer directly to the Bose organization in your country. If you elect to return the product directly to a Bose organization, A. Contact the Bose organization in your country for specific return and shipping instructions; B. Properly pack the product in the original carton for shipping. If you need a new carton, contact the Bose organization in your country for a new carton available at a nominal charge; C. Label and ship, freight prepaid, to the address provided by the Bose organization in your country, and D. Place any necessary return authorization number prominently on the outside of the carton. (Cartons not bearing a return authorization number, where required, will be refused.)

Other conditions

This warranty is fully transferable provided the current owner furnishes the original proof of purchase from an authorized Bose dealer. THE PROVISIONS OF THIS WARRANTY ARE IN LIEU OF ANY OTHER WARRANTY, WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. BOSES MAXIMUM LIABILITY SHALL NOT EXCEED THE ACTUAL PURCHASE PRICE PAID BY YOU FOR THE PRODUCT. IN NO EVENT SHALL BOSE BE LIABLE FOR SPECIAL, INCIDENTAL, CONSEQUENTIAL, OR INDIRECT DAMAGES. This warranty does not cover a defect that has resulted from improper or unreasonable use or maintenance, accident, improper packing, or unauthorized tampering, alteration, or modification as determined solely by us. This warranty is void if the label bearing the serial number has been removed or defaced.

Other law rights

This warranty gives you specific legal rights, and you may also have other rights which vary from state to state or country to country. Some places do not allow limitations on implied warranties or the exclusion or limitation of incidental or consequential damages, so the above limitations or exclusions may not apply to you.
1997 Bose Corporation The Mountain, Framingham, MA 01701-9168 USA JN97884 PN183953 Rev. 01 AM183953 Rev. 01