The Pioneer GM-A3702 is a powerful little amp that delivers a clear sound. It’s not the most feature-rich amp, but for such an affordable price, we can hardly count every missing feature against it. It is an excellent 2-channel amp on a budget.


  • Affordable price
  • Clear sound quality
  • Bridgeable
  • Built-in protection against too much gain
  • Low pass filter


  • No bass boost
  • No fan cooling
  • Lacks preamp outputs

Pioneer takes pride in their ability to make quality car audio equipment, which explains the focus of their GM-A3702 amplified being on the sound itself, rather than the volume.

While this amp boasts a decent 500 watts max output, the marketing speak from Pioneer is keen to point out how clean the audio coming from this amp is.

The GM-A3702 has quite a small footprint, making it ideal for vehicles where space is at a premium. It also makes an excellent amp for creating portable components, such as an all-in-one amp/subwoofer combination that can be easily removed.


The GM-A3702 sports two channels that are capable of powering a pair of speakers with 60 watts RMS a piece at 4 ohms, or 95 watts RMS at 2 ohms. It is also bridgeable, allowing you to run a single channel at 190 watts/4 ohms. This single-channel option combines nicely with the low pass filter, making it a solid choice for powering a subwoofer.

Built-in gain control allows you to tailor the sound of your amp, so you don’t have to worry about the output variance of different radios. You needn’t worry about setting the gain improperly, however. The GM-A3702’s Gain Control Caution feature will automatically reduce the output of your amp if the volume coming from the head unit is too loud.

Aesthetically, this amp keeps it clean and simple. A matt black finish with a single red line adorns the top, with red panels on the sides to house your connections and controls. It won’t set the world of automotive audio equipment alight from a visual standpoint. Still, it has a classy, understated look that certainly won’t look bad in any sound system that is on display.

The amp does lack some of the more basic features, such as fan cooling and bass boost capability. However, being firmly near the lower end of the car amplifier price spectrum, some missing features should be expected. When it comes to features, Pioneer seems to be aiming for quality over quantity with the GM-A3702.


In terms of controls, there is very little to learn. You have your low pass filter control and a gain dial. You will need a small screwdriver to adjust both of these. Other than that, the only features on the amp are the various connections for power, inputs, and outputs.


  • Max Power Output – 500 Watts
  • RMS Power Output – 60 Watts x 2 at 4 ohms
  • Amp Class – Class AB
  • Bridgeable – Yes
  • Width – 9.7″
  • Height – 2.4″
  • Depth – 71″

Video Preview

Vincent Talbot

Last update on 2020-11-09 / Affiliate links / Images from Amazon Product Advertising API