W 300 IEM

Instructions for use

Thank you for choosing Sennheiser!
We have designed this product to give you reliable operation over many years. Over half a century of accumulated expertise in the design and manufacture of high-quality electro-acoustic equipment have made Sennheiser a world-leading company in this field. Please take a few moments to read these instructions carefully, as we want you to enjoy your new Sennheiser products quickly and to the fullest.

Contents

The ew 300 IEM G2 system.... 42
The channel bank system... 42
Safety instructions.... 43 System components.... 43 Overview of operating controls... 44
SR 300 IEM G2 stereo transmitter... EK 300 IEM G2 stereo receiver... Indications and displays on the transmitter... Indications and displays on the receiver.. 46 46
Preparing the components for use... 48
SR 300 IEM G2 stereo transmitter... 48 EK 300 IEM G2 stereo receiver... 51
Using the components... 52
Switching the components on/off... Adjusting the volume.... Adjusting the balance.... Activating/deactivating the lock mode... Attaching the receiver to clothing... The buttons.... Overview of menus.... Working with the operating menu.... Operating menu of the stereo transmitter... Operating menu of the stereo receiver... Switching between channel banks.... Switching between the channels in a channel bank.. Selecting the frequencies to be stored in the channel bank U... Scanning the channel banks for free channels (receiver only).... Multi-channel operation... Adjusting the squelch threshold (receiver only).. Stereo/FOCUS selection (receiver only)... Limiting the volume at the headphone output (receiver only).. Activating/deactivating the frequency boost (receiver only).. Adjusting the sensitivity (transmitter only).. Selecting the standard display... Entering a name.... Loading the factory-preset default settings... Activating/deactivating the pilot tone evaluation (receiver only).. Adjusting the contrast of the graphic display (transmitter only).. Stereo/Mono selection (transmitter only)... Activating/deactivating the lock mode... Exiting the operating menu... 67 67
The operating menu.... 54
Adjustment tips for the operating menu... 62

Troubleshooting.... 68

Error checklist..... 68 Recommendations and tips... 69
Care and maintenance... 69 Additional information... 70
HDX noise reduction... 70 Wireless transmission systems... 70 Squelch..... 71

Specifications.... 72

Connector assignment.... 73

Accessories.... 73

The ew 300 IEM G2 system
With the Sennheiser evolution wireless in-ear monitoring system ew 300 IEM G2 (suitable for both stage and broadcast use), musicians, video and sound amateurs, reporters/broadcasters, etc. can directly monitor the received sound signals without troublesome cables or monitor speakers being required. In addition, the system can also be used for any application where talkback signals are to be transmitted. The evolution wireless in-ear monitoring system ew 300 IEM G2 is a highquality state-of-the-art RF transmission systems with a high level of operational reliability and ease of use. Transmitter and receiver permit wireless transmission with studio-quality sound. The excellent transmission reliability of the ew 300 IEM G2 system is based on the use of further optimized PLL synthesizer and microprocessor technology, the HDX noise reduction system, the pilot tone squelch control (during stereo operation), and the scan function for scanning the channel banks for free channels.

System components

The system consists of: 1 EK 300 IEM G2 stereo receiver 1 SR 300 IEM G2 stereo transmitter 2 batteries 1 telescopic antenna for SR 300 IEM GNT 2-1 mains unit IE 4 in-ear headphones Instructions for use
Overview of operating controls
SR 300 IEM G2 stereo transmitter
Operating controls Headphone output (PHONES), (6.3 mm) jack socket Headphone volume control (VOL) Graphic display, backlit / rocker button, backlit SET button, backlit ON button, backlit (serves as the ESC (cancel) key in the operating menu) Cable grip for power supply DC cable DC socket for connection of mains unit (DC IN) Audio input (AF IN BAL/UNBAL), XLR-3F socket (left and MONO) Audio input (AF IN BAL/UNBAL), XLR-3F socket (right) Service interface (DATA) Type plate Antenna output (ANT), BNC socket
Graphic display panel Display for the current channel bank 1.8, U Display for the current channel number 1.12 B.CH abbreviation for channel bank and channel number Alphanumeric display MHz appears when the frequency is displayed Level display for audio signal AF I (left and MONO), with PEAK warning Level display for audio signal AF II (right), with PEAK warning Lock mode icon (lock mode is activated) Note: For further illustrations and examples of the different standard displays, please refer to the section Selecting the standard display on page 65.
EK 300 IEM G2 stereo receiver

Operating controls Headphone output (PHONES), 3.5 mm jack socket Antenna Red LED for operation and battery status indication (ON/LOW BAT) Green LED for RF signal indication (RF) Charging contacts SET button / rocker button (DOWN/UP) Battery compartment Battery compartment cover Unlocking button ESC button LC display On/off/volume control
LC display panel Alphanumeric display B.CH appears when the channel bank and the channel number are displayed MHz appears when the frequency is displayed 4-step battery status display Lock mode icon (lock mode is activated) PILOT display (pilot tone evaluation is activated) MUTE display (audio output is muted) 7-step level display for received audio signal AF 7-step level display for received RF signal RF

Use a remote antenna (available as an accessory) when the transmitter position is not the best antenna position for optimum transmission. Connecting the mains unit The transmitter is powered via a mains unit. Pass the cable through the cable grip. Insert the DC connector on the mains cable into the DC socket.
Connecting the amplifier/mixing console Connect the amplifier/mixing console to the XLR-3F sockets (left and MONO) or (right). Both balanced and unbalanced connection is possible (see Connector assignment on page 73).
Note: Any unit that is only suitable for mono operation must be connected to XLR-3F socket. In this case, set the transmitter to mono operation via the menu.
Via the Sensitiv menu, adjust the transmitters input sensitivity (see Adjusting the sensitivity (transmitter only) on page 64).
Connecting the headphones/monitoring the audio signal To monitor the audio signal, connect headphones with a (6.3 mm) jack plug to the headphone output (PHONES).

Neue Abbildung

Attention! High volume! Even short exposure to high volume levels will damage your hearing! Set the volume for the connected headphones to the minimum before putting the headphones on.
First, set the volume control to the lowest volume by turning it to the left as far as possible. Then gradually turn up the volume. Volume up? NO! When people use headphones, they tend to choose a higher volume than with loudspeakers. Listening at high volume levels for long periods can lead to permanent hearing defects. Please protect your hearing, Sennheiser headphones have an excellent sound quality even at low volumes. Service interface The service interface is only required for servicing purposes.
19 rack adapter and antenna mount
For mounting one or two transmitters into a 19 rack, you require the GA 2 rack adapter (available as an accessory). The GA 2 rack adapter consists of: 2 rack mount ears 1 connecting bar 1 connecting plate 2 covering plugs for antenna holes 12 recessed head screws M 3xrecessed head screws M 6x10
When mounting only one transmitter into a rack, you can use the AM 2 antenna mount (available as an accessory) to mount the transmitters antenna connection to the front of the GA 2 rack adapter. The AM 2 antenna mount consists of:
2 BNC extension cables (screw-in BNC socket to BNC connector ) 2 plains washers 2 nuts
To mount two transmitters into a rack: Place the two transmitters side by side onto a flat surface, their bottom sides facing upwards. Align the connecting plate over the holes in the bottom sides of the transmitters. Secure the connecting plate using eight of the supplied recessed head screws (M 3x6). Hook the two rack mount ears to the front panels of the transmitters. Secure the rack mount ears to the transmitters using two of the supplied recessed head screws (M 3x6) respectively. Slide the transmitters into the 19 rack. Secure the rack mount ears to the rack.

When mounting only one transmitter into a rack, use the connecting bar instead of the second transmitter. Hook the two rack mount ears to the front panels of the transmitter.
Secure the rack mount ears to the transmitter using two of the supplied recessed head screws (M 3x6) respectively. Secure the connecting bar to one of the rack mount ears using two of the supplied recessed head screws (M 6x10). If you are not front mounting the antennas, insert the two covering plugs into the antenna holes of the connecting bar. Slide the transmitter into the 19 rack. Secure the rack mount ears to the rack.
To mount the transmitters antenna connection to the front of the GA 2 rack adapter using the AM 2 antenna mount: Screw the BNC socket of the BNC extension cables to the connecting bar using the supplied plain washer and nut. Connect the BNC connector to the BNC socket at the rear of the transmitter. Slide the transmitter into the 19 rack. Secure the rack mount ears to the rack. Connect the telescopic antenna to the BNC socket. Pull the end cap to extend the telescopic antenna.
Inserting and replacing the batteries
For powering the EK 300 IEM G2 receiver, two 1.5 V AA size batteries are required. Press the two unlocking buttons and open the battery compartment cover. Insert the two batteries as shown in the diagram on the left. Please observe correct polarity when inserting the batteries. Close the battery compartment. The battery compartment cover locks into place with an audible click. Inserting and charging the accupack
The receiver can also be powered via the rechargeable Sennheiser BA 2015 accupack. Insert the accupack into the battery compartment as described above. The transmitter has two charging contacts and a sensing contact on its short sides. The accupack can be recharged while remaining in the transmitter. Insert the transmitter into the L 2015 charger (see operating manual of the L 2015 charger). Note: For accupack operation of the receiver, only use the BA 2015 accupack In order to ensure optimum operational reliability. For charging the accupack, only use the L 2015 charger. Both the accupack and the charger are available as accessories. The accupack is fitted with an integrated sensor which is via a third contact monitored by the electronics of the receiver and the charger. The sensor is necessary for the following control purposes: The taking into account of the different voltage characteristics of primary cells (batteries) and accupacks. The battery status indications on the displays, the transmission of transmitter battery status information to the rack-mount receivers and the switch-off thresholds at the end of the operating time are corrected correspondingly. Due to the missing sensor, individual rechargeable battery cells will not be identified as accupacks. The monitoring of the accupack temperature during charging in the L 2015 charger. The prevention of improper charging of inserted primary cells (batteries). Due to the missing sensor, individual rechargeable battery cells will also not be charged in the L 2015 charger. Connecting the headphones If you use the receiver as part of the monitoring system, connect the supplied in-ear headphones or any Sennheiser stereo headphones with 3.5 mm stereo jack plug to the headphone output (PHONES). Attention! High volume! Even short exposure to high volume levels will damage your hearing! Set the volume for the connected headphones to the minimum before putting the headphones on. First, set the volume control to the lowest volume by turning it to the left as far as possible. Then gradually turn up the volume. Volume up? NO! When people use headphones, they tend to choose a higher volume than with loudspeakers. Listening at high volume levels for long periods can lead to permanent hearing defects. Please protect your hearing, Sennheiser headphones have an excellent sound quality even at low volumes.

The buttons

Buttons ON (transmitter only) Operating menu Setting mode SET Standard display Operating menu Setting mode / Standard display Operating menu Mode Standard display To. switch the transmitter on and off cancel the entry and return to the standard display cancel the entry and return to the standard display get into the operating menu get into the setting mode of the selected menu store the settings and return to the top menu level without function (transmitter) adjust the balance (receiver) change to the previous menu () or change to the next menu () adjust the setting of the selected menu: option (/) without function cancel the entry and return to the standard display cancel the entry and return to the standard display

Setting mode

ESC (receiver only)
Standard display Operating menu Setting mode

Overview of menus

Transmitter
Display Bank Channel Tune Sensitiv Display Name Reset LCD Contr Mode Lock Exit Function of the menu Switching between channel banks Switching between the channels in a channel bank Setting a receiving frequency for the channel bank U (user bank) Adjusting the sensitivity Selecting the standard display Entering a name Loading the factory-preset default settings Adjusting the contrast of the graphic display Stereo/Mono selection Activating/deactivating the lock mode Exiting the operating menu and returning to the standard display Display BANK CHAN TUNE SCAN SQELCH ST-FOC LTD Hi-BST DISPLY NAME RESET PILOT LOCK EXIT

Receiver

Function of the menu Switching between channel banks Switching between the channels in a channel bank Setting a receiving frequency for the channel bank U (user bank) Scanning a channel bank for free channels Adjusting the squelch threshold Stereo/FOCUS selection Limiting the volume at the headphone output Activating/deactivating the frequency boost Selecting the standard display Entering a name Loading the factory-preset default settings Activating/deactivating the pilot tone evaluation Activating/deactivating the lock mode Exiting the operating menu and returning to the standard display
Working with the operating menu
By way of example of the Tune menu, this section describes how to use the operating menu. After switching the unit on, the standard display is shown on the display panel.

SR 300 IEM G2

Getting into the operating menu Press the SET button to get from the standard display into the operating menu. The last menu selected flashes on the display. With the transmitter, the current setting is additionally displayed.

Selecting a menu Press the / buttons to select a menu. Press the SET button to get into the setting mode of the selected menu. With the receiver, the current setting that can be adjusted flashes on the display. With the transmitter, the name of the menu and the current setting are displayed.
Adjusting a setting Press the / buttons to adjust the setting. By briefly pressing the / buttons, the display jumps either forwards or backwards to the next setting. In the Channel, Tune and Name menu, the / buttons feature a fast search function. If you hold down a button, the display cycles continuously. The fast search function allows you to get fast and easily to your desired setting. With the receiver, the new setting flashes on the display until it is stored.
Storing a setting Press the SET button to store the setting. Stored appears on the display, indicating that the setting has been stored. The display then returns to the top menu level. With most menus, new settings become effective immediately without having to be stored. An exception are the Bank, Channel, Tune and Reset menus of the transmitter and the RESET menu of the receiver. With these menus, new settings only become effective after they have been stored (Stored appears on the display, indicating that the setting has been stored). Exiting the operating menu Select the Exit menu to exit the operating menu and to return to the standard display. When you have entered the operating menu, the transmitters ON button serves as the ESC (cancel) key, i.e. by briefly pressing this button, you cancel your entry and return to the standard display. The receiver has a separate ESC button with which you can cancel your entry.
Operating menu of the stereo transmitter
Exit Menu Exit Bank Channel

Bank 1.01 B.CH

786.300 MHz

Bank 3.01 B.CH

790.250 MHz

Current channel bank

/ : 1.8, U (User Bank)
Changing the channel bank

SET: Stores the setting

Stored Menu Bank 3 Channel 01 Tune 786.400MHz

Changing the channel SET

Channel 3.01 790.250 MHz B.CH
Current channel and corresponding frequency
Channel 3.08 807.900 MHz B.CH

/ : Channel

Stored Menu Channel 08 Tune 807.900MHz Sensitiv 24 dB
Setting the frequency for channel bank "U" SET

Tune U.01 B.CH

797.075 MHz
Current frequency on the selected channel
/ : Transmission frequency in steps of 25 kHz
Stored Menu Tune Sensitiv Display

Sensitiv

797.075MHz 24 dB Frequency

24 dB

Current sensitivity setting

Setting the sensitivity

/ : 0.24 dB, Sensitivity in steps of 8 dB
Stored Menu Sensitiv Display Name

8 dB Frequency VOCAL

Display Frequency

Current standard display

Display Name

/ : Frequency,

Switching between the standard displays
Bank/Channel, Name SET: Stores the setting

Stored

Frequency

Bank/Channel

Menu Display Name Reset

Name VOCAL

Name OCAL

Current transmitter name

Name G CAL

/ : Name (10 characters)

Assigning the transmitter a name

Stored Reset

Letters w/o pronounciation marks, numbers from 0.9, special characters, spaces
SET: 9 x next character, then store

GUITAR

Menu Name GUITAR Reset LCD Contr IIIIII..
Loading the factory-preset default settings

Reset Reset? No

Security check

Reset Reset? Yes

/ : No, Yes
"reset"= Yes: SET: Transmitter loads factorypreset default settings, transmitter is restarted, standard display appears "reset"= No: SET: Reset is cancelled
Menu Reset LCD Contr IIIIII.. Mode Stereo
Adjusting the contrast of the graphic display

LCD Contrast IIIIII..

Current contrast setting

LCD Contrast IIIIIIIIII.

16 steps

STORED

Menu LCD Contr IIIIIIIIII. Mode Stereo Lock Off
Switching between stereo and mono operation

Mode Stereo

Current setting

Mode Mono

/ : Stereo, Mono
STORED Menu Mode Lock Exit

Mono Off

Lock Off
Lock mode activated or deactivated

Lock On

/ : On, Off

Activating the lock mode

Lock mode = On: SET: Stores the setting, returns to standard display Lock mode = Off: SET: Stores the setting

Menu Lock Exit Bank

Exiting the operating menu
Operating menu of the stereo receiver

BANK 1

BANK U

/ : 1.8, U (User

Bank) SET: Stores the setting

STORED CHAN

Current channel or frequency

STORED TUNE

790.025 MHz

791.125 MHz

/ : Receiving
frequency in steps of 25 kHz SET: Stores the setting

STORED SCAN

Scanning the selected channel bank for free channels SET U.

/ : CLEAR, START

09 CH FREE
Start scan = START SET: Scans the selected channel bank for free channels Delete result = CLEAR SET: Releases locked channels

STORED SQELCH

Setting the squelch threshold SET
Current squelch threshold

LO, MID, HI

STORED ST--FOC

SQELCH

ST--FOC
Switching between stereo and FOCUS operation

STEREO

Stereo, Focus
Limiting the volume at the headphone output

LTD.OFF OFF

Limiter activated or deactivated

LTD. ON

/ : OFF, ON

STORED HI--BST

Boosting the AF frequency response SET

HB.OFF OFF

Frequency boost activated or deactivated

HB. ON

STORED DISPLY
Switching between the standard displays SET

/ : FREQ, NAME, CHAN

STORED NAME
Assigning the receiver a name SET

Current receiver name

Enter a name (6 characters) Letters w/o
pronounciation marks, numbers from 0.9, special characters, spaces

STORED RESET

SET: 5 x next character, then store
Loading the factorypreset default settings

RST. NO

RST. OK

/ : OK, NO

"reset" = OK: SET: Receiver loads factorypreset default settings (only pilot tone setting is kept), receiver is restarted, standard display appears
"reset" = NO SET: Reset is cancelled SET
Activating/deactivating the pilot tone transmission

PLT. ON

Pilot tone transmission activated or deactivated

PLT. OFF

/ : ON, OFF

STORED LOCK

Activating the lock mode SET

LOC.OFF OFF

LOC. ON

STORED EXIT

Exiting the operation SET
Lock mode = ON: SET: Stores the setting, ("STORED") returns to standard display Lock mode = OFF: SET: Stores the setting

BAL.L 1

Current balance setting Adjusting the balance

BAL.R 15

/ : BAL.L 1.15,

BAL.--0--, BAL.R 1.15

Adjustment tips for the operating menu
Switching between channel banks BANK Bank
Via the Bank menu, you can switch between the nine channel banks of the ew 300 IEM G2 transmitter and receiver. The channel banks 1 to 8 have up to 12 switchable channels that are factory-preset to a transmission/ receiving frequency (see The channel bank system on page 42). The channel bank U (user bank) also has up to 12 switchable channels to store your selection out of 1440 transmission/receiving frequencies that are freely selectable within the preset frequency range. When switching from one channel bank to another, the channel with the lowest channel number is automatically displayed. If, during the last scan of this channel bank, an interfering frequency was detected on the channel with the lowest channel number, the receiver display panel automatically displays the next free channel (see below).

Adjusting the squelch threshold (receiver only) SQELCH
The receiver is equipped with a squelch that can be adjusted via the SQELCH menu. The squelch eliminates annoying noise when the transmitter is switched off. It also suppresses sudden noise when there is no longer sufficient transmitter power received by the receiver. Note:
Before adjusting the squelch threshold to a different setting, use the volume control to set the volume for the connected headphones to the minimum. There are three possible squelch settings: LO MID HI = low = middle = high
Selecting the setting LO reduces the squelch threshold, selecting the setting HI increases the squelch threshold. Adjust the squelch threshold with the transmitter switched off to the lowest possible setting that suppresses hissing noise.

IMPORTANT!

Notes: If the squelch threshold is adjusted too high, the transmission range will be reduced. Therefore, always adjust the squelch threshold to the lowest possible setting. When in the setting mode of the SQELCH menu, pressing the button for more than three seconds will switch the squelch off. SQ.OFF appears on the display. If no RF signal is being received, hissing noise will occur. This setting is for test purposes only.
Stereo/FOCUS selection (receiver only) ST-FOC
Via the ST-FOC menu, you can switch between stereo and FOCUS operation. In both operating modes, the SR 300 IEM G2 stereo transmitter has to be set to stereo operation. When the receiver is set to stereo operation, the left-right signals are available as usual. When the receiver is set to FOCUS operation, the left-right signals are mixed and are available as a mono signal in both headphone channels. Use the / rocker button to adjust the relative levels of the two separate channels in the mixed mono signal (see Adjusting the balance on page 53).
Limiting the volume at the headphone output (receiver only) LTD
Via the LTD menu, you can switch the limiter on and off. With the limiter switched on, the volume at the headphone output will be reduced.
Activating/deactivating the frequency boost (receiver only) HI-BST
Via the HI-BST menu, you can boost the AF frequency response at 10 kHz. As a result, headphones with magnetic transducers sound better.
Adjusting the sensitivity (transmitter only) Sensitiv

To match the transmitter to the output level of the connected unit (e.g. mixing console), you can adjust the input sensitivity in four steps of 8 dB via the Sensitiv menu. The input sensitivity is adjusted too high when close talking distances, speakers with loud voices or loud music passages cause overmodulation in the transmission link. In this case, the transmitters PEAK warning will light up and the receivers level display for audio signal AF will show full deflection. If, on the other hand, the sensitivity is adjusted too low, the transmission link will be undermodulated, which would result in a signal with high background noise. The sensitivity is correctly adjusted when the level display for audio signal AF shows full deflection only during the loudest passages.
Selecting the standard display DISPLY Display
Via the Display menu, you can select the standard display. SR 300 IEM G2 stereo transmitter Selectable standard display Frequency (display of the frequency) Contents of standard display
Bank/Channel (display of the channel bank and channel number) Name (display of the freely selectable name)
EK 300 IEM stereo receiver Selectable standard display FREQ Contents of standard display
Entering a name NAME Name
Via the Name menu, you can enter a freely selectable name for the transmitter and the receiver. You can, for example, enter the name of the performer for whom the adjustments have been made. The name can be displayed on the standard display and can consist of up to ten characters (transmitter) and up to six characters (receiver) such as: letters (without pronounciation marks), numbers from 0 to 9, special characters e.g. () -. _ and spaces. To enter a name, proceed as follows: Press the SET button to get into the setting mode of the Name menu. The first segment starts flashing on the display. With the / buttons you can now select a character. By briefly pressing
a button, the display jumps either forwards or backwards to the next character. If you hold down a button, the display starts cycling continuously. Press the SET button to change to the next segment and select the next character. Have you entered the name completely? Press the SET button to store your setting and to return to the previous menu level.

Loading the factory-preset default settings RESET Reset
Via the Reset menu, you can load the factory-preset default settings. With the receiver, however, the selected setting for the pilot tone remains unchanged. After the reset, the unit is restarted and the standard display is shown on the display panel.
Activating/deactivating the pilot tone evaluation (receiver only) PILOT Pilot
Via the Pilot menu, you can activate or deactivate the pilot tone evaluation of the receiver. The pilot tone is used to code the transmitters stereo signal, to support the squelch function (Squelch). During stereo operation, the transmitter adds the pilot tone to the transmitted stereo signal and the receiver detects and evaluates the pilot tone. When the transmitter is set to mono operation, deactivate the pilot tone evaluation on the receiver. You can combine units of first and second generation ew 300 IEM systems without any problems.
Adjusting the contrast of the graphic display (transmitter only) LCD-Contr
Via the LCD Contr menu, you can adjust the contrast of the graphic display in 16 steps.
Stereo/Mono selection (transmitter only) Mode
Via the Mode menu, you can switch the transmitter between mono and stereo operation. Note: Connect any unit that only delivers a mono signal to the transmitters left XLR-3F socket and set the transmitter to mono operation. The receiver automatically identifies the transmitted audio signal and does not need to be set to mono operation. However, you have to deactivate the pilot tone evaluation on the receiver.
Activating/deactivating the lock mode LOCK Lock
Via the Lock menu, you can activate or deactiveate the lock mode.
The lock mode icon on the display indicates that the lock mode is activated. To deactivate the lock mode, first press the SET button. Then press the / buttons to select Lock Off. If you confirm your selection by pressing the SET button, the buttons can be operated as usual. SR 300 IEM G2
Exiting the operating menu EXIT Exit
Via the Exit menu, you can exit the operating menu and return to the standard display.

Troubleshooting

Error checklist
Problem No operation indication Possible cause Batteries are flat or accupack is flat (receiver only) No mains connection (transmitter only) No RF signal Transmitter and receiver are not on the same channel Transmitter is out of range Possible solution Replace the batteries or recharge the accupack Check the connections of the mains unit Set transmitter and receiver to the same channel Check the squelch threshold setting (see Adjusting the squelch threshold (receiver only) on page 63) or reduce the distance between transmitter and receiving antenna Deactivate the pilot tone evaluation on the receiver See Adjusting the squelch threshold (receiver only) on page 63) See Adjusting the sensitivity (transmitter only) on page 64 See Adjusting the sensitivity (transmitter only) on page 64 See Scanning the channel banks for free channels (receiver only) on page 62

RF signal available, no audio signal, MUTE display appears on the display panel
Transmitter is set to mono operation and the pilot tone evaluation of the receiver is activated Receivers squelch threshold is adjusted too high
Audio signal has a high level of background noise Audio signal is distorted No access to a certain channel
Transmitter sensitivity is adjusted too low Transmitter sensitivity is adjusted too high During scanning, an RF signal has been detected on this channel and the channel has been locked
If problems occur that are not listed in the above table or if the problems cannot be solved with the proposed solutions, please contact your local Sennheiser agent for assistance.

Recommendations and tips

. for the EK 300 IEM G2 receiver The antenna of the EK 300 IEM G2 should hang freely and be at least 1 cm away from the body. The antenna must not be in direct contact with the skin. for optimum reception Transmission range depends to a large extent on location and can vary from about 10 m to about 150 m. There should be a free line of sight between transmitting and receiving antennas. If, with the SR 300 IEM G2 transmitter, transmission conditions are unfavourable, you should use a remote antenna which is connected via antenna cable. To avoid overmodulating the receiver, observe a minimum distance of 5 m between transmitting and receiving antennas. Observe a minimum distance of 50 cm between transmitting antennas and metal objects (such as cross members or reinforced-concrete walls). for multi-channel operation For multi-channel operation, you can only use the channels in a channel bank. Each of the channel banks 1 to 8 accommodates up to 12 factory-preset frequencies which are intermodulation-free. For alternative frequency combinations, please refer to the enclosed frequency table. The freely selectable frequencies can be selected via the Tune menu and can be stored in the channel bank U. When using several transmitters simultaneously, interference can be avoided by maintaining a minimum distance of 20 cm between two transmitters. For multi-channel applications, use the AC 2 transmitter combiner (see Accessories on page 73).

Care and maintenance

Use a slightly damp cloth to clean the units from time to time. Note: Do not use any cleansing agents or solvents.

Additional information

HDX noise reduction

RF link

Inherent noise of the RF link
The evolution wireless G2 series is equipped with HDX, the Sennheiser noise reduction system that reduces RF interference. It increases the signal-tonoise ratio in wireless audio transmission to more than 110 dB. HDX is a wideband compander system which compresses the audio signal in the transmitter in a 2:1 ratio (related to dB) to lift it above the inherent noise floor of the RF link. In the receiver the signal is expanded in an identical and opposite way in a 1:2 ratio to restore the original signal, at the same time reducing the RF noise to below the noise floor of the receiver. HDX has been specially developed for high quality radiomicrophone systems. Note: Only transmitters and receivers that are equipped with HDX can work correctly with each other. If non HDX equipment was mixed with HDX, the dynamic range would be drastically reduced and the transmission would sound blunt and flat. HDX is permanently active and cannot be switched off.

Wireless transmission systems
With the ew 300 IEM G2 system, Sennheiser puts an end to cable tangles and enables complete freedom of movement. The systems operate exclusively in the UHF band. UHF transmission is extremely reliable and is far less prone to interference than the overcrowded VHF band harmonics from mains units, fluorescent tubes, refrigerators, computers, etc. are virtually eliminated. Also indoor propagation of UHF radio waves is better than VHF so that the RF power can be kept low this is also an advantage when using multi-channel systems. Finally, UHF frequency ranges are being approved all over the world for radiomicrophone usage in some countries licence-free. Correct adjustment of transmitter sensitivity is vital. Too high and you get overmodulation and distortion, too low and you get undermodulation and a noisy signal. Please set the sensitivity correctly for the microphone/usage and check it before every performance to ensure best operation.

Squelch

Pilot tone squelch When the transmitter is set to stereo operation, it adds a 19-kHz pilot tone to the audio signal. The receiver checks incoming audio signals to see if the pilot tone is present. In the absence of the 19-kHz signal, the receivers audio output will remain muted, even if a strong RF signal is present. This prevents strong interfering signals from causing hissing noise in the receiver when the transmitter is switched off. Field strength-dependent squelch Depending on the strength of the received RF signal, the receivers audio output is opened or muted. Via the SQELCH menu of the receiver, the squelch threshold can be adjusted in three steps (LO, MID, HI).

Specifications

System RF characteristics Modulation Frequency ranges Transmission/receiving frequencies wideband FM stereo, MPX pilot tone 518554, 626662, 740776, 786822, 830866 MHz 8 channel banks with up to 12 factory-preset channels each 1 channel bank with up to 12 freely selectable channels (1440 frequencies, tunable in steps of 25 kHz) 36 MHz 24 kHz/48 kHz 15 ppm Sennheiser HDX 4015,000 Hz 19 KHz/4 kHz 91 dB(A) 0.9 % 10 C to +55 C 380 x 370 x 70 approx. 3000 g
Switching bandwidth Nominal/peak deviation Frequency stability AF characteristics Noise reduction system AF frequency response MPX pilot tone (Frequenz/Hub) S/N ratio (at 1 mV and peak deviation) THD (at nominal deviation and 1 kHz) General data Temperature range Dimensions of carrying case [mm] Weight of carrying case IE 4 in-ear headphones Frequency response Max. SPL Impedance EK 300 IEM G2 stereo receiver RF characteristics Receiver principle Sensitivity (with HDX, peak deviation) Adjacent channel rejection Intermodulation attenuation Blocking Squelch