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Welcome
…to the Coustic world of power and clarity. These new Coustic QE Series 4-channel power
amplifiers deliver the cleanest music you’ve ever heard at any power level in the 12-volt environ-
ment.
Besides their sleek contoured design, the new 320/480QE power amplifiers offer the latest and
most sophisticated audio features. This booklet offers you a guided tour of all these exciting fea-
tures. For the best sonic reproduction, please follow the installation suggestions and recommen-
dations as closely as possible. The time you spend will prove to be worthwhile when you sit back
and enjoy the high fidelity music!
To further explore the potential of your Coustic amplifier, we recommend you match it with our
full-feature high performance AM/FM CD/cassette source units, dynamic full-range speakers or
subwoofers, state-of-the-art equalizers and electronic crossovers.
Whatever you need for your ultimate car audio system, look to Coustic - we have the fullest
range of car audio components to meet the most critical demands.
Coustic...a sound investment.
No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any
form or by any means, electronically, mechanically, or otherwise, without the prior written permis-
sion of Mitek Corporation or Coustic.
Please take a moment to complete and mail in the Owners’ Registration Card. (The serial num-
ber of your amplifier is marked on the bottom of its metal chassis.) Please also record the serial
number of your amplifier in the space provided below and keep this manual for future reference.
Serial Number: ________________________________________________________________
Date of Purchase: ______________________________________________________________
FEATURES
MULTI-FUNCTION / MULTI-CHANNEL CIRCUIT DESIGN
The 4-channel 320/480QE amplifier can be configured as a 4-, 3- or 2-channel amplifier with
built-in high-pass/low-pass filters. Each of the front and rear stereo amplifiers can be bridged to
provide maximum system design flexibility. With the filters switched off, this amplifier can be
configured as 2 separate quasi 3-channel amplifiers where each amplifier is capable of
simultaneous mono (subwoofer) and stereo (mid-range) operation.
BUILT-IN ELECTRONIC CROSSOVER WITH CONTINUOUSLY ADJUSTABLE CROSSOVER
FREQUENCIES
You have the choice of selecting full-range, high-pass only or low-pass only. These filters feature
18 dB per octave high-pass and low-pass. Furthermore, the crossover frequencies are
continuously variable for fine-tuning of your audio system.
OVER-CURRENT, SHORT CIRCUIT AND DC OFFSET PROTECTION
The sophisticated circuitry monitors abnormal conditions such as voltage spikes, oscillation, DC
offset or short circuit. When any of these undesirable conditions exceed their respective preset
limits, the circuit will shut down the audio system briefly and light up the protection indicator to
identify the problem for immediate attention. Once the problem is resolved, the amplifier will
resume operation automatically.
TRIPLE DARLINGTON HIGH CURRENT/HIGH VOLTAGE FULLY COMPLEMENTARY OUTPUT
STAGE
Complementary output stage audio circuitry has long been a hallmark of "exotic" home amplifier
design. Coustic is one of the very few car audio manufacturers to incorporate such elaborate
audio circuitry into its power amplifiers. Triple Darlington configuration ensures the audio
amplifier is always operating under optimum conditions.
LINE OUTPUTS
The full-range line outputs can be used to feed signals to another amplifier for your future
expansion or for setting up a more sophisticated system.
WIDE RANGE INPUT SENSITIVITY ADJUSTMENT
The input sensitivity level of the Coustic QE Series amplifiers can be easily varied from as low as
100 mV to as high as 5.0 volts by adjusting the control on the End Panel.
HIGH/LOW IMPEDANCE INPUT
If you are using a floating or common ground car stereo, these amplifiers are the best fit for your
system. They are compatible with floating or common ground car stereo speaker outputs even
without a floating ground adapter. If, in the future, you decide to change to a higher quality after
market source unit with RCA pre-amp outputs (like the Coustic CD527), this same amplifier is
there to give you improved frequency response and better sonic performance.
STABLE INTO 2-OHM LOADS
With the over-designed power supply section and a sophisticated power management circuitry,
these amplifiers can maintain their stability even in the highly reactive low impedance environment.
ADJUSTABLE BASS BOOST
This feature allows you to enhance the bass performance of your sound system. The control is
continuously variable with a maximum boost level of 18 dB.
BUILT-IN REMOTE SUBWOOFER LEVEL CONTROL PORT (not available on 320QE)
This amplifier has a built-in remote subwoofer level control input port. With the optional RS
remote control, the subwoofer output level can be adjusted to compensate for bass fluctuations
in a moving vehicle.
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