Our Product Research Team
At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere.
That's because we have our own in-house Product Research team — they open the box,
verify contents, check the owner's manual, and record dimensions, features and specs.
We stay on top of new products and technologies to help people make informed choices.
Inputs and Outputs Notes
Class D Design: The Coustic
401DB is a Class D amplifier. The proprietary Class D output stage delivers
maximum power with minimal current draw from the vehicle's electrical system
while eliminating traditional Class D interference.
Power Supply: High-current
MOSFET transistors are used in the power supply section to minimize internal
heat and maximize reliability. The combination of the very high
pulse-width-modulated (PWM) switching frequency and the extra large filter
capacitors delivers stronger and deeper transient bass response.
Crossover: The amp is equipped
with a continuously variable 40-200Hz low-pass filter with a steep 36dB/octave
low-pass filter is not defeatable; it is constantly on.
Subsonic Filter: The
amplifier's subsonic filter eliminates ultra-low, inaudible frequencies to
protect your speakers from damaging over-excursion of the cone and to improve
the amp's efficiency. The 3-way switch allows you to choose a cutoff frequency
of 20Hz or 40Hz, or turn the subsonic filter off. Note: No slope
information is given for the subsonic filter.
Protection Circuitry: The
sophisticated protection circuitry monitors abnormal conditions, such as voltage spikes,
oscillation, DC offset, short circuit, or excessive heat buildup. 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. Note: The power and
protect LED glows green to indicate that the amplifier is on and operating
normally. It glows red to indicate when there is a problem that needs to be
Inputs and Outputs Notes
Power/Ground Terminals: The
401DB is equipped with 0.475"-wide power, ground, and remote screw terminals
that can accept up to 4-gauge bare wire or with ring or spade connectors.
Speaker Terminals: The
amplifier provides 0.348"-wide screw terminals to two speakers. For
single-subwoofer systems, only one set should be used. Both sets of terminals
output a mono signal, and are wired internally in parallel (total speaker load should be 2 ohms or higher). They will accept up to 8-gauge bare wire or with ring or
Speaker Level Inputs: If you're
connecting the amplifier to a receiver or factory radio without preamp outputs,
you can use the supplied Speaker Level Input harness. You will need to splice
the receiver/radio's speaker wires to the harness, then simply plug the harness
into the multi-pin Molex jack on the amplifier.
Line Outputs: The line outputs
can be used to feed signals to another amplifier without having to split the
signal or use Y-adapters. They are not affected by the built-in low-pass filter.
Remote Control Port: The amp
has a built-in remote subwoofer level control input port, a 3.5mm (1/8")
mini-jack, compatible with an optional R S remote control (available from the