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Upgrade your in-car listening experience with a Pioneer GM Series amp — it'll provide the power and sound quality you're looking for, all in a reliable package you can count on. Under the hood, solid construction eliminates resonant vibrations that can cause distortion, while an efficient cooling system keeps the amp running clean when it's working hard. Pioneer uses Class D amp technology in this GM Series amp to deliver maximum power from a chassis that's half the size of their conventional models.

The GM-D8500M mono amplifier produces plenty of raw energy to drive your subs, delivering a tight, satisfying kick of up to 600 watts RMS. The variable low-pass filter allows you to tune your sub/box combo for maximum performance, while the variable bass boost adds more thump when you want it. The GM-D8500M includes preamp and speaker-level inputs so you can connect it to almost any system, even a factory stereo.

Product Highlights:

  • mono car amplifier
  • 300 watts RMS x 1 at 4 ohms (600 watts RMS x 1 at 2 ohms)
  • variable low-pass filter (40-240 Hz, 12 dB/oct)
  • variable bass boost (0-12 dB at 50 Hz)
  • CEA-2006 compliant
  • Class D amp technology and MOSFET power supply
  • preamp- and speaker-level inputs
  • fuse rating: 30A x 2
  • requires 4-gauge power and ground leads — wiring and hardware not included with amplifier
  • 13-1/8"W x 2-3/16"H x 7-15/16"D
  • warranty: 1 year
  • Our 60-day money-back guarantee

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.

Pioneer GM-D8500M Reviews

Average Customer Review:

4 Reviews

Good Quality

Written by: jason from fort madison ia on June 28, 2012

great amp hits my 12'' alpine type r hard i play alot of rap music sounds really good but i need 2 no how much a bass knob remote cost me need 2 no thanks

Pros: great amp sounds really good

Cons: the amp switch should been better

Good Quality

Written by: Anonymous from PA on May 22, 2012

Crutchfield Customer Review (What's this?)

Very nice amp. I have this powering two 10" Polk Subs does it just fine. Gets pretty warm but nothing excessive. Very good mounting and I love the remote sub controls that it has, makes controlling the sound when I'm going into town very easy. All in all I would recommend this again and again. Do be careful with this it puts out some power very good build quality as well.



Pioneer GM-D8500M Mono Amp Slams!

Written by: NolanH from North Port Florida on April 7, 2012

Crutchfield Customer Review (What's this?)

I came in search of an amp to power two Sony sub boxex that were way underpowered, a very helpful and imformative Crutchfield advisor named Chad listened to my situation, analyzed my setup and recommended this product. This is exactly what I needed, the sub boxes are rated at 330rms each and this amp gives them everything they can handle, and it handles everything I have thrown at it. I listen to mostly metal, nu metal, evil disco and some electronic and this amp gives the speakers the power to respond to the tight hitting bass and variances on the lower ends too. Couln't be happier with this product and I will turn to Crutchfield more often, especially when the clown at the big box store tried to sell me an amp they didn't even have in stock.

Pros: it has handled all that I have asked it to do, consistent power, nice design and compact sizing for something this powerful. Easy hookup and excellent assistance from Chad the Crutchfield advisor!

Cons: I haven't found the instructions on how to train it to go to work for me, and it won't give me an endless supply of candy bars

pioneer amp GM-D8500M mono blk

Written by: TEA from Citrus Heights, CA on November 11, 2010

this amplifier is loaded with power i love it my GF bought it for me for a gift and a
pioneer 12 the sub didnt last a week be careful with this one its powerful it should be a
signature amp for pioneer i think its the the best bang for the buck. honestly im going
to get a powerful sub for this amp i love it thanks pioneer big shouts out to you guys on
this one.



Hands-on research

What's in the box?

Download owner's manual

  • Mono amplifier
  • Two 30 amp ATO fuses (installed)
  • YXC5142 Remote bass boost control
  • 19' Remote cable (RJ-11 plugs on both ends)
  • 9" Speaker-level input adapter
  • Four 0.75" Self-tapping screws
  • Two 3/8" Self-tapping screws
  • Owner's Manual (Eng/Fre/Spa)
  • Warranty Information
  • Installation Note

Product Research



CEA-2006 Compliant: CEA-2006 is a system of testing & measurement methods for mobile audio amplifiers; both stand-alone amps and those built into head units. This voluntary standard advocates a uniform method for determining an amplifier's RMS power output and signal-to-noise ratio. The criteria for measuring power uses a DC input voltage of 14.4 volts and the RMS power output is measured into a 4Ω load, with 1% or less Total Harmonic Distortion plus noise (THD+N), at the stated frequency range for the amplifier (20 Hz to 240 Hz in this case). Signal-to-Noise ratio is measured in weighted absolute decibels (dBA) at a reference of 1 watt into 4Ω. CEA-2006 allows consumers to compare car amplifiers and receivers on an equal basis. The Pioneer GM-8500M under CEA-2006 regulations is rated at 300 watts RMS x 1 channel with a 54 dBA signal to noise ratio. Also following CEA-2006 guidelines, the 2Ω power rating is 600 watts RMS.

Mono-Power Amp Design: The Pioneer GM-8500M is designed with specific features to power your subwoofers with a frequency range between 10-240 Hz.

Note: This amplifier is not designed to power a full-range speaker.

Class-D Amp: The superior efficiency of a Class-D amplifier means higher power output and greater compactness than an analog amplifier offers. Class-D amplifiers overcome the inefficiencies of traditional Class-A or AB amplifiers. Pioneer's Class-D amps transform very little power into heat so a higher percentage of the power supply (67%) is transformed into the load. This results in a very compact amp which needs less input power to produce very high output power.

Pulse Width Modulator (PWM): The Class-D amplifier's PWM (Pulse Width Modulator) modulates the original audio input signal with a triangulated signal wave which has a much higher fixed frequency. The result is a digital signal which contains both the input signal and a band of frequency components around the modulation frequency. A LPF (Low Pass Filter) then filters out the high frequency pulses and the resulting amplified output signal is then sent to the subwoofer and/or speakers.

2-Ohm Stable: The Pioneer mono-amplifier is capable of handling load impedances down to 2Ω. The amplifier is rated at 600 watts RMS x 1 channel into 2Ω with <1% THD+N.


Gain: Rotary control used to set the amplifier's gain according the level of the incoming signal and continuously variable from 0.2V to 6.5V

Low-Pass Crossover: Built into the GM-D8500M is a very smart crossover network. It works like a gateway, routing the big bass signals (adjustable from 40 to 240Hz or lower, at -12dB/octave) and filtering out higher-frequency signals to that subwoofer. This optimizes your system's efficiency and delivers the best possible sound quality.

Note: The crossover cannot be bypassed.

Bass Boost: For added low frequency performance this amplifier has a bass boost circuit, variable from 0 to +12 dB and centered at 50 Hz. Adjustment is made using the included wired remote. Bass boost gives you more control over how your music sounds. It lets you set the optimal bass level for each subwoofer connected to the GM-D8500M, so the tone controls from your headunit can do what they do best.

Remote Bass Boost: The bass boost circuit is controlled using the included wired remote (YXC5142), which can be mounted within easy reach of the driver. It's helpful when adjusting bass output between different music sources or songs. The remote has integrated flanges on either side to mount the unit under the dash. The remote control measures 2.3125" wide x 1.1875" tall x 2.5" deep.


Power Connections: The power and ground connections will accommodate up to 4-gauge wire. The remote turn-on terminal will accept up to 8-gauge wire. A phillips-head or straight-head screwdriver can be used to tighten and loosen the terminals.

Speaker Level Input: A speaker level to RCA adapter is included; splice your radio's speaker output to the adapter, then plug it into the RCA inputs on the amp. The input switch on the amp should be set to SP (speaker level) or RCA (line level) to match the radio output level.

Speaker Connections: The speaker output terminals will accommodate up to 8-gauge wire. A phillips-head or straight-head screwdriver can be used to tighten and loosen the terminals.

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.