PA D4000.4

Super Efficient Class D Bridgeable 4-Channel Mobile Audio Amplifier

  • Low THD, a high signal-to-noise ratio, plus wide bandwidth frequencies make the PA D4000.4 four-channel a superior choice for distortion-free power
  • 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.
  • $349.00 EACH
  • Free ground shipping on all orders

PA D4000.4

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.

  • Tech Specs
  • Reviews
  • Q & A
  • Support
Tech Specs


  • Total Pieces


  • Included Accessories
    • (4) Phillips Screws
    • (1) Terminal Block Adaptor


  • Carton 1


  • Standard Warranty (When purchased from an Authorized Dealer)
    1 Year
  • Warranty When Bought from and Installed by an Authorized Dealer
    2 Years


  • Total Pieces
  • Height
    1.813" (4.6 cm)
  • Width
    10.938" (27.78 cm)
  • Depth
    6.75" (17.15 cm)
  • Weight
    5 lbs (2.27 kg)
  • RMS Continuous Power @ 4 Ohms
    125 W x 4
  • RMS Continuous Power @ 2 Ohms
    200 W x 4
  • Power Bridged @ 4 Ohms
    400 W x 2
  • Distortion at Rated Power
  • Minimum Impedance Bridged
    4 Ohms
  • Minimum Impedance Not Bridged
    2 Ohms
  • Signal-to-noise Ratio
    105 dB
  • Frequency Response
    20 Hz-20 kHz
  • Damping Factor
  • Crossover Filter Slope (dB/octave)
    12 dB/octave
  • Filter Switch (Front)
    3-position (HPF, Full, BPF)
  • High Pass Filter Frequency Range (Front)
    20 Hz - 4 kHz
  • Low Pass Filter Frequency Range (Front)
    50 Hz - 5 kHz
  • Front Gain Control
    200 mV - 6 V
  • Filter Switch Rear
    3-position (HPF, Full, BPF)
  • High Pass Filter Frequency Range Rear
    20 Hz - 4 kHz
  • Low Pass Filter Frequency Range Rear
    50 Hz - 5 kHz
  • Rear Gain Control
    200 mV - 6 V
  • Line Level Inputs Y N
  • Line Level Outputs (Y/N)
  • LED Power Indicator
  • LED Protection Indicator
  • Supply Voltage
    10 V - 16 V
  • Fusing & Power/Type
    (1) 40A (1) 35A ATC
  • Power Connections
    4 AWG
  • Ground Connections
    4 AWG
  • Speaker Connections
    12 AWG


  • Channels
  • Amplifier Class
    Bridgeable Class D MOSFET
Q & A

Product Documentation

Key Features

Super-Eefficient Class D Design

Runs much cooler than conventional amps.

Toroidal Transformers

Help keep the amplifier’s sleek design under 2" tall while ensuring plenty of clean, efficient power


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, it won’t corrode in humid environments

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