08 May, 2005 PARASOUND ZAMP V.3
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2-Channel Power Amplifier (Z Series)

Parasound Zamp v.3

Parasound Products, Inc., 950 Battery Street, San Francisco, CA 94111. Voice: (415) 397-7100. Fax: (415) 397- 0144. E-mail: sales@parasound.com. Web: www.parasound.com. Zamp v.3 Zone Amplifier, $299.00. Tested sample on loan from manufacturer.
The three most salient facts about the Parasound Zamp v.3 are: (1) its small, only half the width of a conventional audio component, about the size and weight of Merriam-Websters Collegiate Dictionary; (2) its cheap, one dollar under $300 and about 1/30th the price of a pair of similarly powered single-ended triode monoblocks by one of the high-end voodooist manufacturers; (3) its very good, not a whit inferior to those triode jobs. Welcome to the delirious world of comparative consumer audio.

The Design

The Zamp v.3 is a 45/45-watt stereo amplifier. That rating is into 8; into 4 its 60/60 watts. Meaning: the power supply is not too hefty, but for many applications the power is entirely adequate. The power supply isnt switch-mode, as you might have inferred from the size of the amplifier; everything in the Zamp v.3 is analog, and the relatively large toroidal power transformer is cleverly shoehorned into the tight-fitting chassis. Even the speaker terminals (spaced for dual banana plugs, thanks goodness) are slanted instead of vertically placed, to keep the chassis height to a minimum. The terminals can be bridged for mono operation; the rated output into 8 is then 90 watts. Input impedance is 33 k; output impedance is virtually zero. In the back (no, not in front) there are two tiny level controls for the two channels; the maximum gain is 22 dB. Theoretically, you could use the Zamp v.3 to play line-level program material without a preamp, but it would be rather inconvenient to reach behind the chassis every time you wanted to adjust the volume. The level controls are more for gain staging in an installation to achieve the lowest possible overall background noise. Other features are loop jacks next to the input jacks, for passing on the input signal to another audio component; a ground-lift switch to interrupt ground loops (shades of Bryston!); and an automatic signal-sensitive on/off system, including also a 12V external trigger. Lots of bells and whistles for only $299. I did not get a circuit schematic, so well have to do without one of Dr. David Richs circuit critiques you may remember from the old print days.

The Measurements

I usually start with the frequency response at 1 watt into 8; in the case of the Zamp v.3 it is so flat that Ill skip the graph. The response is 0.1 dB down at 20 Hz and 0.25 dB down at 20 kHz; at 50 kHz it is down only 1.4 dB. Flat enough for me. Much more interesting is the THD+N versus power at various frequencies. Fig. 1 shows the 20 Hz, 1 kHz, and 20 kHz distortion into 8; Fig. 2 shows the same into 4. Most publications show only the 1 kHz curve because its usually better than the 20 Hz and nearly always much better than the 20 kHz. (The latter condition is known as dynamic distortion.) Thats the case here, too, but even the 20 kHz distortion is more than good enough for government work;
here, too, but even the 20 kHz distortion is more than good enough for government work; after all, 76 to 77 dB is only about 0.015% and thats still excellent, especially since the measurement bandwidth was expanded to 80 kHz to include the second, third, and fourth harmonic. The distortion curves are essentially noise-dominated, and clipping at each frequency is at approximately the rated power level into both load impedances. Fig. 3 shows the FFT spectrum of a 1 kHz tone at full rated power into 8. The second and third harmonics are at 92 and 94 dB; the higher harmonics line up from 102 dB down; all totally insignificant. This is a clean amplifier.

Fig. 1: THD+N vs. power of one channel into 8 at 20 Hz (green), 1 kHz (cyan), and 20 kHz (red).
Fig. 2: THD+N vs. power of one channel into 4 at 20 Hz (green), 1 kHz (cyan), and 20 kHz (red).
Fig. 3: Spectrum of a 1 kHz tone in one channel at 45 watts into 8.
I also ran a test that I usually dont bother with, namely THD+N versus frequency at 1 watt into 8. Noise becomes more of a factor at such a low level, especially since I opened up the measurement bandwidth to <10 Hz80 kHz. The result is shown in Fig. 4; as you can see, all distortion components are below 82 dB from 20 Hz to 3 kHz, rising to a maximum of 69 dB at 20 kHz. There is absolutely nothing to worry about here; this is all an order of magnitude or more below the threshold of audibility, although some megabuck amplifiers yield better numbers (so what?). The most remarkable thing is that exactly the same test at 40 watts results in virtually identical curves, as shown in Fig. 5.
Fig. 4: THD+N vs. frequency of both channels at 1 watt into 8.
Fig. 5: THD+N vs. frequency of both channels at 40 watts into 8.
The single-point noise measurement, unweighted, with reference to rated maximum output, is 106.5 dB. That, folks, is low noise. Channel separation is shown in Fig. 6. At higher frequencies the numbers are typical of the best amplifiers; at lower frequencies the maximum separation of 66 dB is a little bit on the scant side but still guaranteed inaudible.
Fig. 6: Channel separation at 1 watt into 8.
The ability of an amplifier to drive widely fluctuating load impedances, such as presented by certain loudspeakers, is measured by the PowerCube test. As far as I know, The Audio Critic is the only American audio journal to publish PowerCube measurements. The instrument for the test is made in Sweden; it produces repeated 1 kHz tone bursts of 20 ms duration into 20 different complex load impedances across the amplifier (magnitudes of 8, 4, 2, and 1, phase angles of 60, 30, 0, +30, and +60). The graphic output of the instrument shows the 20 data point connected to form a more or less cubelike polyhedron. The test really separates the men from the boys when it comes to real-world loads rather than just resistances. Unfortunately the computer controlling the instrument is currently on the fritz; as soon as it is repaired I shall append the Zamp v.3 test results here. (Thats one advantage of a Web publicationnothing is carved in stone, everything can be changed.)

The Sound

As I used to state over and over again in the print version of The Audio Critic, all amplifiers having high input impedance, low output impedance, flat frequency response, low distortion, and low noise floor sound exactly the same when operated at matched levels and not clipped. This has been proven so many times in double-blind listening tests that opinions to the contrary by the tweako/weirdo element of the audiophile community and by the subjectivist audio press can be totally disregarded. They just dont get it. The Parasound Zamp v.3 is no exception to the rule. Just because its small and cute and cuddly, just because it costs only $299, it sounds no different from $9000 amplifiers that have comparable power outputs. The possible exception to that statement would be the handling of difficult loads; the PowerCube test will reveal problems, if any, in that area. I have no difficult-to-drive loudspeakers on the premises at the moment. So, pending the PowerCube test, let me conclude with the considered opinion that the Parasound Zamp v.3 is one helluva 45-watt amplifier, regardless of price tag and chassis size. That the price and the size are remarkably small is an aspect of comparison shopping, not of audio performance.

Zone Amplifier

Protect

Hi-Temp

Zamp v.3 Zone Amplier

O w n e rs G u i d e
IMPORTANT SAFETY INSTRUCTIONS
The lightning flash with the arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of dangerous voltage inside the product that may constitute a risk of electric shock. The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance instructions in the literature accompanying the product. TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER. NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL 1. 2. 3. 4. 5. 6. 7. 8. Read Instructions Read all the safety and operating instructions before operating this product. Retain Instructions Retain safety and operating instructions for future reference. Heed Warnings Adhere to all warnings on the product and in the operating instructions. Follow Instructions Follow all operating and use instructions. Cleaning Unplug this product from the wall outlet before cleaning. Use a damp cloth for cleaning. Clean the outside of the product only. Attachments Do not use attachments that are not recommended by the product manufacturer; they may be hazardous. Water and Moisture Do not use this product near water. Accessories Do not place this product on an unstable cart or stand. The product may fall, causing bodily injury and damage to the product. A product and cart combination should be moved with care. Quick stops, excessive force, and uneven surfaces may cause the product and cart to overturn. Ventilation Slots and openings in the cabinet are provided for ventilation to ensure reliable operation of the product and to protect it from overheating. These openings must not be blocked or covered. This product should not be placed in a built-in installation such as a bookcase or rack unless proper ventilation is provided.
10. Power Sources Operate this product only from the type of power source indicated on the label. If you are not sure of the type of power supply to your home, consult your dealer or local power company. This product is equipped with a three-prong grounding plug. This plug will only fit into a grounding power outlet. If you are unable to insert the plug into the outlet, contact your electrician to replace your obsolete outlet. Do not defeat the safety purpose of the grounding plug. 11. Power Cord Protection Power supply cords should be routed so that they are not likely to be walked on or pinched by items placed upon or against them. 12. Lightning Unplug the unit from the wall outlet for added protection during a lightning storm and when it is left unattended and unused for long periods of time. This will prevent damage to the product due to lightning and power line surges. 13. Overloading Do not overload wall outlets or extension cords. This can result in a fire or electric shock. 14. Inserting Objects into Unit Never push objects of any kind into this product through any openings; they may touch dangerous voltage points or short out parts that could result in fire or electric shock. 15. Servicing Do not attempt to repair or service this product yourself. Opening or removing covers may expose you to dangerous voltage and other hazards. Refer all servicing to qualified service personnel. 16. Damage Requiring Service Unplug this product from the wall outlet and refer servicing to qualified service personnel under the following conditions: a) If the power-supply cord or plug is damaged. b) If liquid has been spilled into the product. c) If the product has been exposed to rain or water. d) If the product does not operate normally by following the operating instructions. e) If the product has been dropped or damaged in any way. f) If the product exhibits a distinct change in performance. 17 Replacement Parts When replacement parts are required, be sure the service technician has used. replacement parts specified by the manufacturer. Unauthorized substitutions may result in fire, electric shock, and other hazards. 19. Safety Check Upon completion of any service or repairs to this product, ask the service technician to perform safety checks to determine that the product is in proper operating condition. 20. Wall or Ceiling Mounting Mount the product to a wall or ceiling only as recommended. 21. Heat The product should be situated away from heat sources such as radiators, heat registers, stoves, and other products (including amplifiers) that produce heat. www.parasound.com

TABLE OF CONTENTS

Introduction
115v 230v AC Selector Switch Ventilation Requirements Rack Mounting.
Rear Panel Connections and Controls Front Panel Controls and Indicators Typical Problems and Remedies If You Require Assistance Warranty Repair Specifications

INTRODUCTION

Congratulations and thank you for your purchase of this precision Parasound audio component. The Parasound Zamp v.3 Zone Amplifier is the third generation of one of the worlds most popular and proven audio amplifiers. It has been designed for a wide variety of applications, including multi-room, multi-zone installations, desktop audio, PC-Mac audio, bedroom or den systems. The versatility of the Zamp v.3 allows many connection and configuration options, so please be sure to read this manual thoroughly before you begin installation.

Unpacking

Carefully unpack your Zamp v.3 and these accessories:
Detachable AC power cord Black trigger wire with a 2.5 mm sub-mini plug at each end 3.5mm jack to 2.5mm plug adapter Please inspect the unit now and contact your Parasound Dealer promptly if you see evidence of shipping damage. Save the carton and packing inserts in case you move or in the event you need to ship your amplifier for repair. Before you proceed, locate the five digit serial number on the rear panel or underside of the unit and record it here for future reference:
Serial #: __________________________________________________________________________ Date of Purchase:__________________________________________________________________ Parasound Dealer: ________________________________________________________________ Phone Number: __________________________________________________________________
AC VOLTAGE, INSTALLATION AND RACK MOUNTING
115v - 230v AC Voltage Selector Switch
This switch is found on the chassis bottom. The 115V position of this switch is correct for North America; most other countries require setting it to 230V. Make sure the 115/230V switch is set for the correct AC line (mains) voltage before you connect the Zamp v.3s power cord and before you install it. The unit may be seriously damaged if this switch is set incorrectly.

Installation and Ventilation Requirements
Install your Zamp v.3 away from heat sources such as heating ducts, radiators, or other heatproducing components. Always position the Zamp v.3 horizontally. Observe the following ventilation guidelines when installing the Zamp v.3 in an equipment rack or any other enclosed space: You should never install the Zamp v.3 in an unventilated equipment cabinet or compartment because hot air will not exhaust adequately to prevent overheating. Air wont often circulate adequately in a cabinet or enclosure whose front and back sides are open; pockets of intense heat can still develop around any heat-producing equipment. Therefore, a ventilation fan is highly recommended. Allow a few inches of empty space on each side and above the unit and try to avoid crowding or stacking the Zamp v.3 tightly between other components. A ventilation fan is also recommended where other equipment must be mounted close to the Zamp v.3. Do not place the unit on carpeting or any other material that could obstruct air flow into the ventilation holes in its chassis bottom.

Rack Mounting

The Zamp v.3 occupies only half the width of a single rack space in a standard 19" equipment rack. For rack mounting, you can fasten it to another Parasound Z series model by using the Parasound SBS (Side-by-Side) mounting kit. You can also mount a single Zamp v.3 in the rack with the accessory Zblank panel. The SBS includes four rack mount bolts plus four pairs of plastic shoulder washers. The washers are important because they insulate the Zamp v.3 front panel (and chassis) from the metal equipment rack and from the four mounting bolts. Locate these washers on both sides of the front panel before the mounting bolts are screwed into the rack rail.

Zamp v.3

SBS Behind Panels

Zblank panel

REAR PANEL CONNECTIONS AND CONTROLS

Connection Precautions

Disconnect the AC cord before making or changing any input, trigger, or speaker wire connections. Make sure there is no strain or tension on any wires that could cause them to pull loose.

Audio In Jacks

Connect the cables from your preamplifier or multi-room controllers output jacks to the Zamp v.3 L and R audio In jacks.

Loop Jacks

The L and R Loop jacks are convenient output connections for an additional power amplifier. These jacks eliminate the need for Y connectors to drive both your Zamp v.3 and another amplifier from the same source.

R and L Level Knobs

You can adjust the gain for each channel to achieve the lowest noise and widest dynamic range in your system or installation. Start with the 12 oclock mid-position of each knob on the Zamp v.3 and turn each one clockwise for higher gain or counter-clockwise for lower gain. Note: We encourage you to experiment with different gain settings for your preamp or controller and the Zamp v.3 to find those gain settings where your systems background noise is lowest. Among sound professionals this procedure is known as gain staging.

Speaker Connections

Each pair of five-way speaker terminals accepts bare speaker wires up to AWG 12, wires terminated with 14" spade lugs, and single or dual banana plugs which are 34" (19mm) apart. If you use bare wires, remove only enough insulation, about 12" (12mm) for each exposed bare wire to insert through the small hole in the side of the binding post. Before inserting a bare wire, twist the strands tightly between your fingers to prevent strays that might touch the chassis or another terminal and cause a short circuit. If you have soldering experience you may want to tin the stripped bare wire with solder for a cleaner termination and to prevent the wire from oxidizing.
Mono St Use R In R Level L

Gnd Lift

Auto On

R+ Zamp v.3

115V /230V 60Hz /50Hz 5W 3A Fuse Only

Audio Sens

Man 12V
AVIS: RISQUE DE CHOC ELECTRIQUE-NE PAS OUVRIR.
Zamp V.3 Zone Amplifier Parasound Products, Inc. San Francisco, CA USA
LAC Voltage Selector On Bottom
Correct Speaker Polarity is Important
As you connect the speaker wires, you can see that the insulation on one of the two wires in each pair has either printing or a raised ridge. The marking lets you know which wire you connected to the positive speaker terminal at its other end. Make sure the + wire you attach to each Zamp v.3 + speaker terminal is attached to the + terminal of the speaker for that channel.

Stereo - Mono Switch

The Zamp v.3 power should always be turned off before moving this switch. For normal operation this switch must be to the right in its ST (stereo) position. For bridged mono operation, move this switch left to its Mono position. Note: Stereo sound will be faint and very distorted if you accidentally leave this switch in its Mono position.
REAR PANEL CONNECTIONS AND CONTROLS continued

Mono Operation

We recommend an 8 minimum speaker load for bridged mono operation. In mono the Zamp v.3 bridges the R channel to amplify only the positive half of the audio signal and the L channel to amplify only the negative half of the audio signal. In effect, each channel sees only half of the speakers rated impedance, so that an 8 speaker in mono is only a 4 load and a 4 speaker in mono is a punishing 2 load. Note: Do not attach a mono speaker load that is less than 4 to avoid overloading and overheating the Zamp v.3.
Mono Input and Speaker Connections
1. Turn the unit off and remove the AC cord. 2. Connect the single cable from the preamp or controller to the R channel audio In jack. 3. Set the Mono-ST (stereo) switch to its Mono position. 4. Connect the positive lead of the speaker wire to the red R + channel speaker terminal. 5. Connect the negative lead of the speaker wire to the red L + channel speaker terminal. Note: The R + and L + terminals are spaced too far apart to accept a dual-banana plug. 6. Do not connect anything to either channels speaker terminal. 7. Reconnect the AC cord.

Automatic Turn On Options
For convenience, there are two ways the Zamp v.3 can be triggered to turn on automatically. - When a suitable voltage is applied to its 12V In (input) jack. - When an audio signal is present at the L and R audio IN (input) jacks. When automatic turn on is selected the Zamp v.3 front panel Power button is disabled so that on/off is determined solely by the triggering preamp or controller.
12V Position When the Auto On switch is set to the right in its 12V position, the Zamp v.3 is turned on and off with an external +9 V to + 12 V voltage from your controller. When the external voltage ceases the Zamp v.3 will turn off immediately. The 12V switch position disables the front panel Power button. Man (Manual) Position When the Auto On switch is in its middle MAN (manual) position, the auto turn on function is disabled and the Zamp v.3 must be turned on and off manually with the Power button on its front panel. Audio Position When the Auto On switch is set to the left in its Audio position, the Zamp v.3 will be turned on whenever an audio signal is present at its Left and Right Input jacks. After audio signals cease, the Zamp v.3 will remain turned on for about ten minutes. This prevents it from shutting down during pauses in the music. The Audio position of the Auto On switch also disables the front panel Power button.

12V In Connection

The Zamp v.3 12V input uses a 2.5mm sub-mini jack. To trigger the Zamp v.3, plug one end of the provided cord into this jack and the other end into the source components trigger output. Some components may use a 3.5mm trigger output jack, so we have also included a 3.5mm plug - 2.5mm adapter. If the control components trigger output is a + and - terminal, you can cut the 2.5mm plug off one end of the included trigger wire and attach the bare wires to these terminals. The lead with the white stripe on it corresponds to the plugs tip and the unmarked lead corresponds to the sleeve of the plug. Note: If the trigger voltage source is DC, the trigger plug tip must be + (positive) and its sleeve (negative). The Zamp v.3 trigger current draw is a negligible 15 mA.
12V Trigger Out Connection
The Trigger Out jack lets you loop or daisy-chain the incoming trigger voltage to an additional Zamp v.3 or other component. Note: The total load on your preamp or controllers trigger output is the sum of the current drawn by the trigger circuits of each of the components youve linked together.
Audio Trigger Sensitivity Knob
The Auto On Audio Sensitivity knob adjusts the incoming audio level or the threshold required to turn on the Zamp v.3. Its 12 oclock position will be suitable in most cases. To increase sensitivity to respond to lower level audio signals, turn the knob counter-clockwise toward +. Turn the knob clockwise toward to decrease its sensitivity. This will prevent spurious noise and switching transients in your system from turning on the Zamp v.3.

Gnd (Ground) Lift Switch

Gnd is the normal position for this switch. If you hear background hum in the speakers connected to the Zamp v.3, try setting the Ground Lift Switch to its Lift position. The Ground Lift Switch disconnects or lifts the audio circuit ground from the chassis ground. This often helps to eliminate audible hum that results from ground loops. Ground loops are multiple ground paths such as the metal-to-metal contact with the panels or chassis of other components combined with the ground connections of the audio cables or even the ground wires of the various AC cords.
AC Power Connections and AC Grounding
If possible, plug your Zamp v.3 into the same AC outlet that your accompanying audio components (especially the system controller) are plugged into. The ground potential between different AC outlets may be higher or lower, resulting in audible hum.
FRONT PANEL CONTROLS AND INDICATORS

Power Button

Press the Power button once to turn the Zamp v.3 on, press it again to turn it off. Note: The Power button is inoperative when the Auto On switch is set to Audio or 12V.
L and R Channel Indicators
L and R will illuminate green when the Zamp v.3 is turned on and is operating normally. The green L or R indicator will not light if the fault condition is only in that channel. Neither L or R will illuminate if there is a general fault or if the temperature is too high.

Protect Indicator

Protect will illuminate red when the Zamp v.3 has experienced either an internal or external fault condition which has also activated its protection circuit to prevent internal damage. Note: It is normal for Protect to flash on for seconds after the unit is turned on.

Hi-Temp Indicator

Hi-Temp will illuminate red when the Zamp v.3 reaches its maximum safe operating temperature. If the heat persists the unit will soon shut itself off for protection and will remain off until the temperature drops. If Hi-Temp appears, the unit has been over-driven at too high a listening level and/or too low impedance speaker load or has not been provided with sufficient ventilation.

Headphone Jack

The headphone jack on the front panel accepts a 18" (3.5 mm) plug. Its high current headphone circuit will easily drive headphones with an impedance of 8 or higher. The output to the speaker terminals is disconnected when you plug headphones into the Zamp v.3.

Maintaining Your Zamp v.3
Your Parasound Zamp v.3 power amplifier requires no periodic maintenance other than to receive an occasional flattering remark. It has no user-serviceable parts inside. To avoid the risk of electric shock, do not remove its top cover. The exterior can be cleaned with a soft cloth pre-moistened only with a few drops of water or glass cleaner.
TYPICAL PROBLEMS AND REMEDIES

No sound

Check that AC is live. Check that input cables and speaker wires are secure at both ends. Make sure the control preamp/receiver is switched to the correct input. Is the unit on? Check setting of the Auto On switch. If using Auto turn on, increase the sensitivity of the audio trigger. Is the Hi-Temp or Protect (or both) illuminated? Check for excessive temperature, short circuited speaker wires, low impedance speaker load, and inadequate ventilation to remove heat.

Background Hum

Move the Ground switch to Lift. Move audio cables and AC cords away from each other. Try different routes for the audio cables and AC cords. Make sure insulating shoulder washers are used if unit is rack mounted. Try reversing the direction of the AC plugs in other components, one by one.

Distorted and Weak Sound

Check the position of the Mono-ST switch. It must be in ST to play stereo. Make sure the load impedance is not below 4 ohms. Make sure the gain of the preamp is not set too low. Make sure the gain controls of the Zamp v.3 are not set too low.
IF YOU REQUIRE ASSISTANCE
Call your Parasound dealer first. If the dealer cant help you with your problem we encourage you to call Parasounds Technical Service Department, toll-free at 1-866-770-8324, Monday - Friday, 7am - 5pm Pacific time. We can suggest other diagnostic tests you can easily perform. If we determine that your Zamp v.3 should be returned to Parasound or an Authorized Parasound Warranty Center for inspection and possible servicing, we will provide the location of a warranty center near you or shipping instructions for the units return to Parasound.
Before You Return Any Unit to Parasound for Service
Before you send your unit to Parasound, you will need to obtain a specific Return Authorization (RA) number and shipping instructions from Parasounds Technical Department. The RA number must be clearly marked on the outer carton. Use the original factory packing materials and arrange adequate insurance to cover its value. You must include a copy of your purchase receipt, since this document establishes the validity of this units warranty. Warranty repairs are only performed by Parasound or Parasound Authorized warranty centers when your purchase receipt is from a Parasound Authorized Dealer or Parasound Authorized Reseller. Units Will Be Refused by Parasound Under the Following Conditions 1. Unit was sent without the Parasound-assigned RA number marked on the carton. 2. Unit was sent in an unsuitable shipping carton, likely to have been damaged in transit. 3. Unit has inadequate packing, unit likely to have been damaged in transit. 4. Unit was shipped collect for shipping charges. We do not accept collect shipments. 5. Unit was shipped via the US Postal Service. 6. Unit was sent to an address other than the address instructed by our Technical Department. Note: The shipping address is not the same as Parasounds office address.

Warranty Repair

Read your accompanying Parasound Limited Warranty carefully to understand the applicable rights and limitations. This section provides instructions for obtaining repairs, both for units covered under the Parasound Limited Warranty and for units or situations which are outside the Warranty. Unit is not eligible for repair under the terms of the Parasound warranty if: 1. Unit was not purchased from a Parasound Authorized Dealer or Parasound Authorized Reseller. 2. Units serial number was removed, modified, or defaced. 3. Unit shows evidence of abuse and/or misuse. 4. Unit was modified in any way. 5. A prior repair was attempted by an unauthorized repair station.
PARASOUND ZAMP V.3 SPECIFICATIONS
Continuous Power Output Stereo
45 watts RMS x 2, 20 Hz-20 kHz, 8 , both channels driven 60 watts RMS x 2, 20 Hz-20 kHz, 4 , both channels driven

Dynamic Headroom

1.5 dB

Inter-Channel Crosstalk

80 dB at 1 kHz; 60 dB at 20 kHz
Continuous Power Output Mono
90 watts RMS, 20 Hz-20 kHz, 8 minimum impedance

Damping Factor

400 at 20 Hz
Audio Trigger Sensitivity Current Capacity
12 amps peak per channel 5 mV to 200 mV
12V Trigger Current Requirement Frequency Response
5 Hz - 100 kHz, +0/-3 dB, 1 watt 15 mA
AC Power Requirement Total Harmonic Distortion
0.07%, at 8 , 0.1% at 4 , full output 0.02%, average listening levels V / 220 -240 V, Hz 1 watt standby; 220 watts full output

Dimensions IM Distortion

0.05 % 912" Wide 10" Deep with connectors 2" High with feet, 134" panel only 241 x 254 x 50mm, 44.1mm panel only

Transient IM Distortion

Not measurable

Slew Rate

90 V/second

Net and Shipping Weight

6.65 lbs., 3 kg; 9 lbs., 4.1 kg

S/N Ratio

116 dB, input shorted, IHF A-weighted

Rack Mount Accessories

May be Purchased Separately SBS: Bracket and bolts to attach two Z series units side-by-side in a standard 19" equipment rack. Zblank: 912" x 134" blank panel, required to mount a single Z series unit; Zblank kit includes one SBS.

Input Impedance

Input Sensitivity
600 mV; 1.5 V for full output
Parasound Products, Inc. 950 Battery Street, San Francisco, CA 94111 Customer Service 415-397-7100 / Technical Dept. 415-675-7272 / Fax 415-397-0144 www.parasound.com
Rev 0.91 Parasound Products, Inc. 2004