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Polk Audio PA D4000.4

4-channel car amplifier — 125 watts RMS x 4

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  • Polk Audio PA D4000.4

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  • Polk Audio PA D4000.4

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Item# 107PAD4K4 offer details

 
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Polk Audio

My system has plenty of power. Who needs an amp?

You might think you don't need an amp because you have a 400-watt system in your car, or because your new stereo puts out 50 watts a channel. But those are peak wattage ratings, which may boil down to 15 or 20 watts per channel, using the more realistic RMS rating. An amp sends your speakers the power they need to deliver your music with clarity and impact, whether you're using factory speakers or high-performance components. And low-frequency reproduction requires lots of power, so an amp is an absolute must if you're adding a sub to your system.

Our take on the Polk Audio PA D4000.4

by Buck Pomerantz

Small amp — big power

Polk's PA D4000.4 4-channel amplifier may be small, but it can power your front and rear speakers with up to 125 watts RMS each. Or, you can switch this little beast over to 2-channel mode to drive a couple subwoofers with up to 200 watts RMS each. However you use it, this amplifier will fit in almost any location in your vehicle because of its convenient size and shape.

Great looks and a clear voice

Polk developed and employed their full-range Class D amp technology that helps this amp reproduce music very cleanly, with no added coloration or distortion. Separate high- and low-pass filters on the front and rear channels allow this versatile amp to run a variety of speaker systems, like bi-amped mid-bass and tweeter components, or two front speakers and a sub. This amp's tough, good-looking stainless steel case won't tarnish, even in extremely humid conditions.

Highlights:

  • 4-channel car amplifier
  • 125 watts RMS x 4 at 4 ohms (200 watts RMS x 4 at 2 ohms)
  • 200 watts RMS x 2 in bridged mode (4-ohm stable in bridged mode)
  • separate variable high-pass filters for front and rear channels (20-4000 Hz, 12 dB per octave)
  • separate variable low-pass filters for front and rear channels (50-5000 Hz, 12 dB per octave)
  • preamp inputs
  • fuse rating: 30A x 2
  • 4-gauge power and ground leads recommended — wiring and hardware not included with amplifier
  • 11-3/4"W x 1-13/16"H x 6-3/4"D
  • warranty: 1 year
  • Our 60-day money-back guarantee
Shop all Polk Audio Car Amplifiers
     

    Hands-on research from the Crutchfield Labs (what are the Labs?)

    Features and Specs

    Features and Specs
    Performance
    RMS Power Output (Watts x Channels)
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    125 x 4
    Peak Power Output (Watts x Channels)
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    N/A
    Power at 2 Ohms (Watts x Channels)
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    200 x 4
    Bridged Power (Watts x Channels)
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    400 x 2
    Minimum Impedance Bridged
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    4
    Minimum Impedance Unbridged
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    2
    Best Frequency Response
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    20-20k Hz
    THD at Rated RMS Power
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    0.1%
    Signal to Noise Ratio
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    105 dB
    Input Voltage
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    14.4v
    Features
    Amplifier Class
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    D
    Low-Pass Crossover Frequency
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    50-5000 Hz
    Low-Pass Slope (dB/octave)
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    12 dB/octave
    High-Pass Crossover Frequency
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    20-4000 Hz
    High-Pass Slope (dB/octave)
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    12 dB/octaave
    Bass Boost
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    No
    Bass Boost Frequency
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    N/A
    Fan Cooled
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    No
    Fuse Rating
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    75
    Speaker Level Inputs
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    No
    Preamp Outputs
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    No
    Width (inches)
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    11-3/4
    Height (inches)
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    1-13/16
    Depth (inches)
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    6-3/4
    Parts Warranty
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    1 Year
    Labor Warranty
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    1 Year

    Product Research

    Product Research
    What's in the box?

    Download owner's manual

    • Four channel amplifier
    • Two 35 amp ATO fuses (1 installed/ 1 extra)
    • Two 40 amp ATO fuses (1 installed/ 1 extra)
    • Four 1" Self-tapping screws
    • Owner's manual (English/ French/ Spanish/ German/ Italian/ Portuguese)
    • On-line product registration information

    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.

    Controls
    Connections

    Controls

    Input Mode: Set the input mode switch to 4-channel when using four outputs from your head unit, set to ST (stereo) when using two outputs from your head unit.

    Front/Rear: The front and rear sections have independent controls for gain and crossover settings:

    • Level Control: rotary gain controls; continuously variable from 200 mV to 6 V
    • Crossover Mode Switch: The crossover has three mode options:
      • Full: crossover is bypassed
      • HPF: High Pass Filter
      • BPF: Band Pass Filter, both the high pass and low pass crossovers are engaged, useful for powering midrange speakers, or a subwoofer with the high pass crossover used as a sub-sonic filter
    • High Pass Crossover Frequency: the high pass crossover points are continuously variable from 20 Hz to 400 Hz, or 200 Hz to 4 kHz, depending on the frequency multiplier switch
    • High Pass Frequency Multiplier: 2-position switch; specifies the variable high pass crossover point range; 20 Hz to 400 Hz (x1), or 200 Hz to 4 kHz (x10)
    • Low Pass Crossover Frequency: the low pass crossover point is continuously variable from 50 Hz to 500 Hz, or 500 Hz to 5 kHz, depending on the frequency multiplier switch
    • Low Pass Frequency Multiplier: 2-position switch; specifies the variable low pass crossover point range; 50 Hz to 500 Hz (x1), or 500 Hz to 5 kHz (x10)

    Connections

    Power/Ground: set screw terminals; accept bare speaker wire up to 4 gauge (4 gauge wire recommended)

    Remote Turn-on: set screw terminal; accepts bare speaker wire up to 8 gauge

    Speaker Terminals: four pair of set screw terminals; accept bare speaker wire up to 8 gauge

    Line Level Inputs: two pair of nickel-plated stereo RCA jacks

    Fuses: one 40-amp and one 35-amp ATO fuse

     

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    Accessories

    Add accessories for the Polk Audio PA D4000.4

    You'll need an amp wiring kit to install your new amplifier, as wiring is not included. See all categories & accessories

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    EFX 4-gauge Amplifier Wiring Kit Power and signal connections for your new amp
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    Autosound 2000 Disc Four Amplifier Optimizer Test CD
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    SquareTrade Warranty 3 Year Warranty
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    In business since 1999, SquareTrade is the largest independent warranty provider in the U.S.

    100% parts and labor - no deductibles

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    Your item's repaired or the full item price returned withing 5 days

    Runs concurrent with manufacturer's warranty

    Rated 5-stars by consumers

    For a more in-depth review and enhanced detailed information on the Polk Audio PA D4000.4, please visit the Crutchfield website product page (/S-0Xyje9Ymj9D/p_107PAD4K4/Polk-Audio-PA-D4000-4.html ).

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    Sorry, the Polk Audio PA D4000.4 is no longer available for purchase.

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      Polk Audio PA D4000.4
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      Polk Audio PA D4000.4