Pioneer GM-D8500M

Mono subwoofer amplifier — 600 watts RMS x 1 at 2 ohms

  • Pioneer GM-D8500M


  • Pioneer GM-D8500M


  • Pioneer GM-D8500M


Crutchfield OMC logo
We don't check this item for fit or compatibility.
Item #: 130GMD850M

Review Summary

This item is no longer available to purchase.
Contact us for other options
Call   Email  
Original price $279.99
We recommend this similar item, or shop all All Car Amplifiers

Our take on the Pioneer GM-D8500M

by Buck Pomerantz

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.

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.

See more info on this item


  • 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

Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and Specs
RMS Power Output (Watts x Channels) 300 x 1
Peak Power Output (Watts x Channels) 1200 x 1
Power at 2 Ohms (Watts x Channels) 600 x 1
Bridged Power (Watts x Channels) 0 x N/A
Minimum Impedance Bridged N/A
Minimum Impedance Unbridged 2
Best Frequency Response 10-240 Hz
THD at Rated RMS Power 1%
Signal to Noise Ratio 54 dB
Input Voltage 14.4v
Amplifier Class D
Low-Pass Crossover Frequency 40-240
Low-Pass Slope (dB/octave) 12 dB/oct
High-Pass Crossover Frequency N/A
High-Pass Slope (dB/octave) N/A
Bass Boost 0-12 dB
Bass Boost Frequency 50 Hz
Fan Cooled No
Fuse Rating 60
Speaker Level Inputs RCA/Speaker Adapt.
Preamp Outputs No
Width (inches) 13-1/8
Height (inches) 2-3/16
Depth (inches) 7-15/16
Parts Warranty 1 Year
Labor Warranty 1 Year
Product 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

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 open the box, verify contents, 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.



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.

Review this product
Great Gear Giveaway rewards card

Submit a review and then enter to win a $500 rewards card

Pioneer GM-D8500M Reviews

Average Customer Review:

4 people say:

Review this product:

Thanks for taking the time to share your experiences about this product. Please be sure to focus your comments on the product itself. Read our Review Guidelines for more information.

Your email won't be visible. Please use the email address that is associated with your order.
(e.g., JohnD) Your review will be signed using the display name and location
(e.g., Charlottesville, VA)

Click on a star to rate the overall product on a scale of 1-5
1500 characters left
Attach a YouTube Review
Crutchfield Video Review Guidelines
  • Only submit videos that you made or are authorized to use.
  • Do not submit videos that contain music, video or visuals that are copyrighted and belong to someone else.
  • Please see our Review Guidelines for more information.
500 characters left
500 characters left
Filter by rating:
5 out of 5

Good Quality

Written By jason, fort madison ia on Thursday, 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
great amp sounds really good
the amp switch should been better
Was this review helpful?    Yes | No
5 out of 5

Good Quality

Written By Anonymous, PA on Tuesday, 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.
1 out of 1 people found this helpful
Was this review helpful?    Yes | No
5 out of 5

Pioneer GM-D8500M Mono Amp Slams!

Written By NolanH, North Port Florida on Saturday, April 07, 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.
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!
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
4 out of 4 people found this helpful
Was this review helpful?    Yes | No
5 out of 5

pioneer amp GM-D8500M mono blk

Written By TEA, Citrus Heights, CA on Thursday, 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.
14 out of 17 people found this helpful
Was this review helpful?    Yes | No

Add accessories for the Pioneer GM-D8500M

You'll need an amp wiring kit to install your new amplifier, as wiring is not included. See all categories & accessories

EFX PA4BX Wiring Kit 4-gauge amplifier wiring kit — includes 2-channel patch cable
4 people say
Your Price: $79.99
Add to Cart
Rockford Fosgate RFK4 4-gauge amplifier power wiring kit
10 people say
Your Price: $114.99
Add to Cart
Rockford Fosgate RFK4X Complete 4-gauge amplifier wiring kit
Includes patch cable and speaker wire
12 people say
Your Price: $159.99
Add to Cart
T-Spec 16-gauge Speaker Wire Black/white jacket — priced per foot
13 people say
Your Price: $0.69
Add to Cart
T-Spec 12-gauge Speaker Wire Black/white jacket — priced per foot
29 people say
Your Price: $1.99
Add to Cart
Stinger PRO Series Speaker Wire Priced per foot (16 Gauge, Black)
49 people say
Your Price: $0.39
Add to Cart
T-Spec 2-Channel RCA Patch Cables Available in 7 different lengths (17-foot)
25 people say
Your Price: $19.99
Add to Cart
54 people say
Your Price: $9.99
Add to Cart
EFX CFHG4 Fuse Holder In-line AGU fuse holder accepts 4- to 8-gauge wire
Your Price: $9.99
Add to Cart
Rockford Fosgate RFFAGU Fuse Holder Platinum-plated AGU fuse holder
Fits 4- or 8-gauge cable
25 people say
Your Price: $10.99
Add to Cart
T-Spec Capacitor 1.5-farad capacitor with red LCD meter
11 people say
Your Price: $79.99
Add to Cart
S&G Wire Cutter/Stripper Tool Cuts and strips 12- to 22-gauge wire
15 people say
Your Price: $19.99
Add to Cart
S&G Tool Aid 87650 Door Trim and Panel Removal Tool
67 people say
Your Price: $9.99
Add to Cart
Pro.Fit Hook Tool Set Installation tools — pair
9 people say
Your Price: $6.49
Add to Cart
Pro.Fit Trim Panel Tool Remove your vehicle's trim panels without damage
87 people say
Your Price: $5.99
Add to Cart
Pro.Fit Wire Worm Installation tool helps route wiring through tight spaces
31 people say
Your Price: $12.99
Add to Cart
Bojo Trim Panel Tools Set of 6 pry tools — helps remove interior and exterior trim and door panels
52 people say
Your Price: $24.99
Add to Cart
Skewdriver Pro SPK4042 Ratcheting straight and offset screwdriver set with 40 bits (Skewdriver Pro with ratchet handle, pictured)
8 people say
Your Price: $49.99
Add to Cart
Bojo Trim Panel Tools Set of 6 pry tools — helps remove interior and exterior trim and door panels
2 people say
Your Price: $29.99
Add to Cart
InstallCard: Amp or Equalizer Prepaid professional amplifier or EQ installation
17 people say
Your Price: $79.99
Add to Cart

Why choose SquareTrade?

The #1-Rated Protection Plan

Thousands of people have reviewed SquareTrade Protection Plans — and made us #1.

5-Day Service Guarantee & Free Shipping

We'll repair or replace your item in five business days or less after we've received it, or your plan is free. And, as always, we pay for all shipping.

Protection from Normal, Everyday Use

Repairing your average mechanical or electrical failure can cost as much as buying a new device. With SquareTrade, you're covered — including parts and labor.

3 Year Protection Plan
3 Year Protection Plan
Your Price: $41.99
Add to Cart

For a more in-depth review and enhanced detailed information on the Pioneer GM-D8500M, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_130GMD850M/Pioneer-GM-D8500M.html ).