SKU: PAD4000.4

Polk Audio PA D4000.4

Taking the Polk Audio PA D Series Into the Digital Era

RRP $579.00
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The PA D4000.4 is Polk Audio's new high-efficient digital 4-channel amplifier. This amplifier is perfect for providing the correct amount of power to a complete four speaker upgrade to your car audio system. The ability to bridge channels will give you more options on amplifying other applications such as subwoofers. This 4-channel can do amplify anything from high-end speakers to 4 entry level subwoofers.

How does Polk Audio improve on their already popular and very well known PA D series amplifiers? With technology advances, Polk Audio has taken their PA D series into the digital amplification arena. This means a smaller foot print, a super-efficient design which allows for lower power consumption and does away with a larger power supply. This allows the new digital PA D series amplifiers to run far more efficiently with lower distortion and cutting or clipping. The new PA D Digital series amplifiers are available in a monoblock, 2-channel, 4-channel, and 5-channel configuration making them accessible for any application. With a height of under 2 inches for all four configurations, these amplifiers also offer a mounting convenience making them practically perfect for any vehicle. All four configurations feature a 4-way protection circuitry and stainless steel hardware that will not corrode, giving the amplifier longevity and a sleek and stylish look. Polk Audio is a known and trusted company and with these new PA D Digital series amplifiers not only are you getting the high Polk Audio quality, you are now getting the quality in a very high and efficient digital range.


  • PA D Series 4-Channel Class D Car Amplifier
  • RMS Power Rating:
    • 4 ohms: 125 watts x 4 chan.
    • 2 ohms: 200 watts x 4 chan.
    • Bridged, 4 ohms: 400 watts x 2 chan.
  • CEA-2006 Compliant Amplifier
  • Pulse Width Modulated MOSFET power supply
  • LED power (blue) and protect (red) indicators
  • Soft start turn-on
  • 4, 3 and 2 Channel Operation
  • 4-way protection circuitry (thermal, overload, reverse polarity & speaker short protection)
  • Heavy duty aluminum alloy heat-sink
  • Nickel-plated RCA level inputs
  • Nickel-plated screw terminals
  • Input sensitivity: 200mV - 6V
  • Frequency Response: 20 - 20,000 Hz
  • Damping Factor: >100
  • Total Harmonic Distortion (THD): <0.1%
  • Signal to Noise Ration: 105 dBA
  • Selectable crossover modes: LPF / FULL / HPF , with 10x Multiplier
  • Variable high-pass filter: 20 - 400 Hz (10x Capable), 12 dB/octave
  • Variable low-pass filter: 50 - 500 Hz (10x Capable), 12 dB/octave
  • Fuse Rating: 40A x 1 + 35A x 1
  • Supply Voltage: 10V - 16V
  • 12 AWG Speaker Connections
  • 4 gauge OFC power and ground wiring is recommended for installation.
  • Dimensions: 6-3/4"W x 10-15/16"L x 1-13/16"H
  • 1-year Manufacturer's Warranty


Power Specifications - Full Range Channels

RMS Power @ 4 ohms
125 watts x 4 channels
RMS Power @ 2 ohms
200 watts x 4 channels
RMS Power @ 1 ohm
Not Stable
Bridged RMS Power
400 watts x 2 channels

Amplifier Specifications

Amplifier Class
Number of Channels
Total RMS Power Output
800 watts
Maximum Input Gauge Size
Minimum Impedance Unbridged
2 ohms
Minimum Impedance Bridged
4 ohms
THD at Rated RMS Power
Speaker Level Inputs
Preamp Outputs
Built-in Crossover
Low-Pass (LP)
High-Pass (HP)
Full (AP)
High-Pass Crossover Frequency
20 - 4000 Hz
Low-Pass Crossover Frequency
50 - 5000 Hz
Signal-to-Noise Ratio
105 dB
Bass/Gain Remote
Fan Cooled
Fuse Rating
40A x 1 and 35A X 1
Total Fuse Rating
CEA-2006 Compliant
SKU PAD4000.4
Model # PA D4000.4
Brand Polk
Shipping Weight 2.8000kg
Shipping Width 0.350m
Shipping Height 0.110m
Shipping Length 0.240m
Shipping Cubic 0.009240000m3

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