PA D4000.4

Super efficient class D bridgable 4-channel mobile audio amplifier

1 13/16" H x 10 15/16" W x 6 3/4" D
4.60cm H x 27.78cm W x 17.14cm D



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This is How You Build a Really Cool Amplifier

The PA D4000.4 amplifier is capable of bridging two full-range channels into a single full range channel with higher output power. For instance, one front and one rear channel will increase the output power from 125W per channel to 400W per channel (for a 4 ohm load). The most common hookups for the PA D4000.4 would be four full-range channels, two full-range channels and a bridged sub, or two bridged subwoofers.

PA D4000.4 Features:

Super-efficient class D design—Runs much cooler than conventional amps.

High-speed MOSFET—Switching power supply.

Toroidal transformers—Help keep the amplifier’s sleek design under 2-inch tall while ensuring plenty of clean, efficient power.

Protection—Thermal, DC offset, reverse DC voltage and short circuit protection.

Nickel-plated wire terminals & RCA connectors—Ensure maximum signal transfer.

Front & rear level controls—Adjust the gain of the front and rear channels to match the output voltage from your head unit.

Low-pass & high-pass frequency controls—Enables you to adjust crossover overlap for better blending of speakers.

Front & rear BPF, FULL, HPF switches—Selects full range, high pass filter, or bandpass filter to dial in your speaker blending.

Channel mode switch (ST/4Ch)—In the stereo position, the amplifier will send the same signal to front and rear channels.

Stainless steel hardware—Used throughout won’t corrode in humid environments.


Total Frequency Response20Hz-20kHz 
Signal-to-noise (Referenced to rated power)105 dBA
Distortion at Rated Power<0.1 %
Minimum Impedance Bridged4 ohms
Minimum Impedance Not Bridged2 ohms
Protection CircuitryThermal, DC offset, reverse DC voltage and short circuit; fuses: one 40 Amp and one 35 Amp ATC 
High Pass Filter
Filter Slope12dB/octave 
Filter Frequency20Hz-4kHz (front)/20Hz-4kHz(rear) 
Low Pass Filter
Filter Slope12dB/octave 
Filter Frequency50Hz-5kHz(front)/50Hz-5kHz(rear) 
Effective Damping Factor>100 
Max Sensitivity200mV-6V dB


Cabinet Dimensions
Height1 13/16" (4.60cm) 
Width10 15/16" (27.78cm) 
Depth6 3/4" (17.14cm) 
Product Weight (each)5.0 lbs. pounds
Without Panels
Height1 13/16" (4.60cm) 
Width10 15/16" (27.78cm) 
Depth6 3/4" (17.14cm) 

Amplifier Specs

Channel NotesBridgeable Class D MOSFET 
12V & Ground Cable Gauge4AWG 

Amplifier Power Specs

RMS Power at 14.4V
Watts per channel NOT bridged @ 1 kHz
4 ohms125 watts
2 ohms200 watts
Watts per channel bridged
4 ohms400 watts

Specifications, dimensions and features subject to change without notice. For more information call us at 1-800-377-7655 (USA and Canada). Outside of North America call +1 (410) 358-3600.

PA D4000.4 Media

PA D4000.4 Literature

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PA D4000.4 Accessories