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Item#: 0HF-001E-00018

Pioneer GM-A6604 Compact 4 Channel Car Amplifier

  • 60 watts RMS x 4 at 4 ohms
  • 180 watts RMS x 2 in bridged mode
  • Bass boost
  • 8-gauge power and ground leads recommended
  • Switchable high- and low-pass filters

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  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

Pioneer Compact 4 Channel Car Amplifier - GM-A6604

  • 760 Watts Max Power
  • Variable LPF (low pass filter) and HPF (high pass filter) for Greater Audio System Flexibility
  • Speaker Level Inputs
  • Bass Boost


Feel the Difference

From dramatic distinction to dramatic design, Pioneer's new GM-Series amplifiers are thrillers in every sense, pushing the limits of flexibility and functionality.

The 4-channel GM-A6604 delivers a whopping 760 watts max - plenty of juice to power your speakers. It's also got built-in low-pass/high-pass crossovers, speaker level inputs for easy connection to an OEM headunit and oversized power terminals.


CEA2006 Specifications

  • Power Output: 60 Watts RMS x 4 Channels (4 ohms = 1% THD+N)
  • Signal-to-Noise Ratio: 95 dBA (Reference: 1 Watt into 4 ohms)

Inspired By Excellence

Pioneer is constantly finding ways to make amplifier technology better. Our new and improved GM-Series prove how you can add cutting edge technology and more power to your system without breaking the bank. Like all Pioneer products, these amps are fully tested to ensure that each is designed and built for performance.

Higher Power

Having more power isn't just about LOUD. It's also about CLEAN, getting the most out of your speakers and your music. Constant road noise makes it hard for the music to be heard clearly. But with 760 watts max. power, you'll get to hear all the words and all the notes.

Variable LPF/HPF

Variable LPF (low-pass filter) and HPF (high-pass filter) allow for adjustable frequency between 40 Hz to 500 Hz and greater car audio system flexibility according to subwoofer characteristics and personal listening preferences. The GM-A6604 has a variable LPF/HPF on Ch. B and fixed LPF/HPF on Ch. A.

High Capacity Switching Power Supply

To suppress power supply loss, GM-Series amplifiers incorporate a large toroidal transformer and are driven using a high-speed switching MOSFET. This stabilization of power supply maintains stable playback of all types of music.

Gain Control

What is power without control? To accommodate the varying range of signal levels coming from today's factory and aftermarket radios, all of Pioneer's GM-series amplifiers feature adjustable gain controls. This means that no matter what kind of radio is connected to this amplifier, the appropriate gain control adjustment can be made to ensure loud, clear, distortion-free music. And even if the gain control level is set improperly, Pioneer's Gain Control Caution feature will automatically reduce the amplifier's output until the headunit volume is decreased to acceptable levels. This added layer of protection helps to prevent damage from occurring to the amplifier and the speakers connected to it due to improper gain control adjustments.

Bringing The System Together

What, you DON'T own a Pioneer headunit? Well, we won't hold it against you. In fact we'll even help you build onto your system. The GM-A6604's speaker level inputs allow you to connect your OEM unit (or any unit that doesn't have the typical RCA-type inputs) without having to buy add-on adapters. SO, the install goes faster, you save money, and you've got a Pioneer amp in your vehicle.






Amplifier Channels
4 Channels


RMS Power
60 watts RMS x 4 at 4 ohms
180 watts RMS x 2 in bridged mode


Bass boost

8-gauge power and ground leads recommended

Switchable high- and low-pass filters
Warranty, Returns, And Additional Information

Do you own this product? Write a Review

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  • Michael M.
  • 7/6/2015 7:53:06 PM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsGreat performance!

Pros: Good power out. Very "smooth" sound. Lots of adjustability for various inputs & outputs. Generates very little heat. Reasonable price. Overall an excellent amplifier for upgrading a stock truck stereo system.

Cons: None yet. Performance has been flawless and I have zero complaints.

Other Thoughts: While not a top-of-the-line amplifier to feed a mega-dollar system, it performs just fine in providing a much better listening experience over the OEM equipment.

Did you find this review helpful? Yes No

  • Anthony S.
  • 5/29/2014 7:47:21 AM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

4 out of 5 eggsPackaging

Pros: The amp works well. I have it tuned perfectly for my 4v pre-outs and it works well powering two 6x9's for now. I intend to finish hooking up 6.5's tonight to use the full four channels. The 6x9's are very powerful and clean with the deck at 3/4 volume--I cannot stomach much higher and neither could my neighbors.

Cons: The packaging was dismal. There was some bubble-wrap on all but one side. The amp was in its original box, though there was no instruction manual or other accessories. This makes me think the item was possibly open-box or tampered with previously. Nonetheless it does work (at least the B-channels do. I will test the A-channels tonight.) Packaging was the only reason I docked an egg.

Other Thoughts: I have HPF tuned to 63Hz before it ever reaches the amplifier, so I cannot attest to the high and low-pass features of this amp as I am not using them. I am not pushing gain higher than matched 4v pre-outs. I prefer sound quality over loudness/clipping and I want my car audio equipment to last.

1 out of 1 people found this review helpful. Did you? Yes No

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Home > 
Automotive & Industrial > 
Car Electronics > 
Car Amplifiers > 
Pioneer > 
Item#: 0HF-001E-00018
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