Power Acoustik PWM-20

4-Band Parametric Equalizer with Subwoofer Electronic Crossover


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  • 4-Band Parametric Equalizer
  • Integrated subwoofer electronic crossover (30-250 Hz)
  • Isolated P.W.M power supply
  • 8V Maximum output voltage
  • Rotary input/output control
  • Subwoofer volume control
  • Master volume/fader control
  • Four band parametric EQ with separate ±18 dB boost controls
  • Night illumination (Red)
  • CD input
  • Signal-to-Noise Ratio: 110 dB
  • THD (Total Harmonic Distortion): 0.4%
  • Authorized Internet Dealer
  • 1-Year Manufacturer's warranty

Equalizer Specifications

Type of Equalizer
This determines the way the equalizer processes the signal from the source unit. A parametric equalizer allows to you adjust the center point of the frequency band you are adjusting as well the bandwidth which can be narrowed or widened. A graphic equalizer has fixed frequency bands and bandwidth and only the frequency bands can be adjusted. A digital equalizer uses a software program to tune your system.
A graphic equalizer typically has more adjustable bands and is less expensive, whereas a parametric will have fewer bands but offer a greater level of control and provide more tuning options. Digital equalizers will tune your system with the most detail and precision but require a computer and are typically a little higher in price.
Speaker Level Inputs
Speaker level inputs are commonly referred to as high-level inputs and vice versa. This input type allows you to get your audio signal directly from the speaker wire in your vehicle, instead of using RCA cables. The advantage of this is factory integration, as most stock radios do not have RCA outputs to run amplifiers.
Total Number of Inputs
This is the total number of input connections that go into the unit.
Total Number of Outputs
This is the total number of output connections that the unit will produce.

Specials with this Item

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Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
4 Star
3 Star
2 Star
1 Star

Average Attribution Rating


Trinidad and Tobago

Very Good Preamp.

November 16, 2011

Firstly to be unbiased this preamp is not the best in the market but it still is a good competitor and can standup against other major brands. Considering the circuitry as mentioned in the review above mine, it is a bit cheap because you do get a thump (Which isn't a major issue to me). I have owned the Clarion EQS746 preamp before this and must say even though the clarion may have a 7 band Eq for frequency tuning and volume, I find this abit easier and very accurate. I use this in a setup with a Pioneer 3300UB headunit two amps, four 6"s and One Pioneer w307d4 12" sub and I've tuned everything to clarity for high volumes. With the Clarion EQS746 I struggled to tune my bass to get a defined sound but since I bought this preamp I configured my sub frequency very accurate. The Variable Subwoofer Low-Pass Crossover within this eliminates any non sub frequency from entering which is great. I'm impressed with this preamp's performance and I just love the blue LED lights illuminating. I recommend this for any system, you wouldn't be disappointed folks. Buy this or the Pwn19.

22 of 25 found this helpful

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Accessory Tools and Products

Accessories added

NVX XWS1625 25 ft. of 16 Gauge Speaker Cable/Wire

25 ft. of True Spec 16 Gauge EnvyFlex Speaker Cable/Wire (100% Oxygen-Free Copper)

Your Price $17.99

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Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Power Acoustik PWM-20

Item Added to Cart

Power Acoustik PWM-20

4-Band Parametric Equalizer with Subwoofer Electronic Crossover


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NVX XWS1625 25 ft. of 16 Gauge Speaker Cable/Wire

25 ft. of True Spec 16 Gauge EnvyFlex Speaker Cable/Wire (100% Oxygen-Free Copper)



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