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WELCOME
. . . to the Coustic world of power and clarity. The new 401DB/801DB class D mono-block ampli-
fiers deliver the highest quality low frequency reproduction you’ve ever heard at any power level
in the 12-volt environment. Besides the sleek contoured design, the 401DB/801DB amplifiers
have all the latest and most sophisticated audio features. This manual offers you a guided tour of
all these exciting features. For the best sonic reproduction, please follow the installation sugges-
tions and recommendations as closely as possible. The time you spend will prove to be worth-
while 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
dynamic subwoofers and electronic crossovers.
Whatever you need for your ultimate car audio system, look to Coustic - for a wide range of car
audio components to meet the most critical demands.
That’s because . . . COUSTIC ROCKS!
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 Coustic or Mitek Corporation.
Please take a moment to register your purchase on line @ coustic.com.
Please record the serial number of your amplifier in the space provided below and keep this man-
ual for future reference, as well as your sales receipt as proof of ownership. (The serial number of
your amplifier is marked on the bottom of its metal chassis.)
Serial Number:
Date of Purchase:
FEATURES
BUILT-IN, ELECTRONIC, LOW-PASS CROSSOVER WITH CONTINUOUSLY
ADJUSTABLE CROSSOVER FREQUENCIES
An electronic crossover has many advantages over passive crossovers - lower cost, simplified yet
more flexible system design, lower distortion and higher gain structure. The 401DB/801DB power
amplifiers are equipped with built-in, 36dB per octave, continuously adjustable, low-pass, electron-
ic crossovers to ensure optimum system performance.
OVER-CURRENT, SHORT CIRCUIT AND DC OFFSET PROTECTION
The sophisticated circuitry monitors abnormal conditions such as voltage spikes, oscillation, DC off-
set or short circuit. When any of these undesirable conditions exceed their respective preset limits,
the circuit will shut down the audio system briefly and the protection indicator lights up to identify
the problem for immediate attention. Once the problem is resolved, the amplifier will resume oper-
ation automatically.
HIGH SPEED, HIGH CURRENT, MOSFET SWITCHING POWER SUPPLY
High current MOSFET transistors are used in the power supply section to minimize internal heat
and maximize reliability. Furthermore, the combination of the very high pulse-width-modulated
(PWM) switching frequency and the extra large filter capacitance guarantees stronger and deeper
transient bass response.
D-BLOCK TECHNOLOGY
This proprietary class D output stage is used to deliver maximum power with minimal current draw
from the vehicles electrical system while eliminating traditional class D interference.
LINE OUPTUTS
The full-range line outputs can be used to feed signals to another amplifier for your future expan-
sion or for setting up a more sophisticated system.
WIDE RANGE INPUT SENSITIVITY ADJUSTMENT
The input sensitivity level of the Coustic 401DB/801DB amplifiers can be easily varied from as
low as 100 mV to as high as 5.0 Volts by adjusting the control on the Input Panel.
LINE LEVEL AND SPEAKER LEVEL INPUTS
These amplifiers feature pre-amp inputs for use with source units that have RCA or line level out-
puts. These amplifiers also feature speaker level inputs allowing the amplifier to work with source
units that do not have RCA or line level outputs. The audio signal can be obtained by simply con-
necting the amplifier’s speaker level input wires to the source unit’s speaker level outputs wires. If
you are using a floating or common ground car radio, this amplifier is the best fit for your system.
It is compatible with floating or common ground car radio speaker outputs even without a floating
ground adapter.
ADJUSTABLE BASS BOOST
This feature allows you to enhance the bass performance of your sound system. The control is con-
tinuously variable with a maximum boost level of 18dB.
DEFEATABLE SUBSONIC FILTER
This feature allows you to maximize the amplifier’s ouput when a specifically tuned subwoofer sys-
tem is needed.
REMOTE SUBWOOFER GAIN CONTROL PORT (R S)
This amplifier has a built-in, remote subwoofer level control input port. With the optional R S
remote control, the subwoofer output level can be adjusted to compensate for bass fluctuations in
a moving vehicle.
MULTI-FUNCTION PROTECTION INDICATOR
When the red protect indicator lights up, it signifies a high operating temperature is detected, and
the amplifier is temporarily shut down to allow for a cooling period. As soon as the temperature
returns to a safe level, the amplifier will restart and resume normal operation.
This indicator also lights up when the amplifier detects either an over-current situation, shorted
speaker outputs or a DC offset at the outputs. Turn off the amplifier, double-check all inputs and
speaker connections to make sure there is no short or inappropriate inputs. If all connections are
in order, turn on the amplifier to resume operation.
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