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It's a dark and stormy night. As you hit the road, you switch on your headlights, fog lamps, windshield wipers, air conditioner and rear window defogger. Now you fire up your stereo and pop in your bass-bomb CD. Sounds kinda wimpy, like your car's electrical system just can't provide your amp the current it needs.

Not if you installed the Pioneer GM-X332 amplifier with a PWM regulated MOSFET power supply. It delivers full power, no matter what kind of voltage your alternator decides to fork over.

This chrome-plated, American-engineered beauty has big honking MOSFET output devices, too. The sound it produces is so clear and powerful, you'll think the band's in your backseat. But there's a lot more than sheer muscle up Pioneer's sleeve. System signal path is Colorado mountain stream clean, thanks to gold-plated inputs, low distortion levels, and high signal-to-noise ratios.

Looking to build a killer multi-amp system? Pioneer makes it easy, with built-in high-pass/low-pass crossovers. Bring on your high-end head unit — this amp accepts at least 4 volts of preamp signal.

  • stereo, bridged mono or Tri-way output for 2-channel models
  • 35 watts RMS x 2 (100 x1 mono)
  • PWM MOSFET power supply
  • speaker short, thermal, and DC protection with LED indicator
  • speaker-level inputs
  • 80 Hz low-pass and high-pass crossovers, 18 dB per octave
  • bass boost, 0-12 dB at 60Hz
  • 103 dB signal-to-noise ratio
  • 50 x 2 watts into 2 ohms
  • 20 amp fuse
  • THD at rated RMS power 0.08%
  • 8-15/16"W x 2-3/16"H x 9-1/2"D

Pioneer GM-X332 Reviews

Average Customer Review:

1 Review

Small but powerful have had this amp for almost 20 years just awesome

Written by: Oldskool from Kck on January 3, 2016

Long lasting powerful little amp. Have had the same amp gm-x332 for all most 20 years. Just awesome.



Hands-on research

What's in the box?

Download owner's manual

  • Gray amplifier with Silver colored trim and 20-amp blade fuse in body; 4 self-tapping mounting screws; Instruction sheet (English and French); Warranty card; Product Registration/Survey card

Product Research

Special Features
More Specs and Notes

Manual Correction:  

  • The manual incorrectly states the amplifier can be used with 1-ohm stereo and 2-ohm bridged mono loads. The minimum stereo load is 2-ohms, and the minimum bridged mono load is 4-ohms.


There is a variable input sensitivity control that is adjustable from 0.4 to 4.5 Volts when using pre-amp inputs.

There is a bass boost control centered on 60Hz that is continuously variable from 0 to +12dB.

A crossover switch can be set at low pass (80Hz with 18dB/octave), off, or high pass (80Hz with 12dB/octave).


  • Screw terminals for main 12Volt power input, ground and remote turn on.
  • Screw terminals for left and right speaker level input.
  • Screw terminals for left and right speaker output. Bridged operation uses the right(-) and left(+) speaker terminals.
  • One pair of RCA pre-amp level inputs are provided.

Special Features

  • The amplifier is a silver color with a gold colored Pioneer logo.
  • In stereo mode, the minimum impedance is 2 ohms.
  • In bridged mode, the minimum impedance allowed is 4 ohms.  
  • There is a red power LED on top of the unit.

More Specs and Notes

All power outputs are at 14.4V input voltage; (10.8-15.1V allowable)

Maximum power output (peak): 70 watts x 2 or 200 watts x 1

Continuous power at 2 Ohms: 50 watts x 2, 20-20k, 0.8% THD

Separation: 65dB at 1K

Current consumption: 12 Amps (at continuous power, 4 Ohms)

Average current drawn: 3.5 Amps (4 ohms, 2 channels); 6Amps (4 ohms, 1 channel)

Note: Although this unit has protection circuitry, the manual does not detail the conditions under which the circuitry activates. The manual says "the protective circuit will cut the power supply to the amplifier when an abnormal condition occurs".

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 verify what’s in the box, 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.