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Pioneer GM-D8604

4-channel car amplifier — 100 watts RMS x 4

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  • Pioneer GM-D8604

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  • Pioneer GM-D8604

  • Pioneer GM-D8604

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Our take on the Pioneer GM-D8604

by Buck Pomerantz
Pioneer

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.

Cool power

Pioneer's sharp-looking GM-D8604 4-channel amplifier can send 100 watts RMS to each of your front and rear speakers, for powerful music that'll get you and your car rockin'. Highly efficient Class D technology keeps this powerful amp running as cool as it looks, and allows for a compact chassis that fits in a lot of out-of-the-way spaces. If you're building a big system in stages, you can use this versatile amp at first to drive a pair of speakers with the front two channels while bridging the rear channels together to power a subwoofer with up to 300 watts RMS. Later on, you can get Pioneer's big mono amp to drive your subs, and switch this amp over to run all four of your full-range speakers.

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Connecting and tuning made simple

If your car stereo doesn't have RCA outputs, you can use the speaker-level inputs to hook this amp into your system — the amplifier switches its input mode automatically when it detects the high-level signal. And the built-in high- and low-pass filters let you adjust the sound for your car's interior, whether you're driving speakers or subs.

Highlights:

  • 4-channel car amplifier
  • 100 watts RMS x 4 at 4 ohms (150 watts RMS x 4 at 2 ohms)
  • 125 watts RMS x 4 at 1 ohm
  • 300 watts RMS x 2 bridged at 4 ohms (250 watts RMS x 2 bridged at 2 ohms)
  • CEA-2006 compliant
  • full-range Class D amp technology
  • variable high- and low-pass filters (40-500 Hz, 12 dB per octave)
  • preamp inputs and outputs
  • speaker-level inputs via supplied RCA-type adapters
  • fuse rating: 30A x 3
  • 4-gauge power and ground leads recommended — wiring and hardware not included with amplifier
  • 11"W x 2-3/8"H x 7-7/8"D
  • warranty: 1 year
  • Our 60-day money-back guarantee

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

Features and Specs
Performance
RMS Power Output (Watts x Channels) 100 x 4
Peak Power Output (Watts x Channels) 600 x 2
Power at 2 Ohms (Watts x Channels) 150 x 4
Bridged Power (Watts x Channels) 300 x 2
Minimum Impedance Bridged 2
Minimum Impedance Unbridged 1
Best Frequency Response 10-50k Hz
THD at Rated RMS Power 1%
Signal to Noise Ratio 75 dB
Input Voltage 14.4v
Features
Amplifier Class FD
Low-Pass Crossover Frequency 40-500 Hz
Low-Pass Slope (dB/octave) 12 dB/octave
High-Pass Crossover Frequency 40-500 Hz
High-Pass Slope (dB/octave) 12 dB/octave
Bass Boost No
Bass Boost Frequency N/A
Fan Cooled No
Fuse Rating 60
Speaker Level Inputs RCA
Preamp Outputs 1 pair
Width (inches) 11
Height (inches) 2-3/8
Depth (inches) 7-7/8
Parts Warranty 1 Year
Labor Warranty 1 Year
Product Research
What's in the box?

Download owner's manual

  • 4-Channel amplifier
  • Two 30 amp ATO fuses (installed)
  • Two 8" Speaker-level input adapters
  • 3mm Allen wrench
  • Four 5/8" Self-tapping screws
  • Owner's manual (English/ French/ Spanish)
  • Warranty information

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.

Features
Controls
Connections

Features

CEA 2006 Compliant: The Pioneer GM-D8604 4-channel amplifier power ratings are measured according to the Consumer Electronics Association's CEA-2006 standards. These standards allow you to accurately compare the rated power output of all CEA-2006 compliant amplifiers, even from different brands. Manufacturers who adhere to the standards can display the CEA-2006 logo on their products and packaging. CEA-2006 Specifications:

  • Power Output:
    • 100 watts x 4 at 4-ohms with <1% THD+N
    • 150 watts x 4 at 2-ohms with <1% THD+N
    • 300 watts x 2 at 4-ohms with <1% THD+N (bridged)
  • Signal to Noise Ratio: 75 dBA

Class-FD Amp: A Class-D amplifier offers higher power in a smaller chassis than conventional Class-AB amp designs. Pioneer's exclusive Class-FD design not only delivers full-range Class-D amplification, but is more efficient than other designs. The result is clear full-range sound in a small amplifier. The ultra-compact design provides many installation options.

Channel Layout: The GM-D8604 is a 4-channel amplifier; both halves are bridgeable, so it can be wired as 4-channel, 3-channel, or 2-channel. Rather than front and rear, the two sections of the amp are labeled A and B (on both the inputs and outputs).

Auto Turn-on: When using a high voltage speaker level input, a signal sensing circuit will automatically turn the amp on and off along with the source unit.

Controls

Input Select Switch: The amplifier's input select switch allows you to choose between 4-channel and 2-channel mode. The 4-channel mode requires that two pair of RCA inputs be connected to the amplifier's A and B inputs, while the 2-channel mode only requires one pair connected to the A inputs.

Gain Control: There are independent gain controls for the A and B amplifier sections, each is continuously variable from 200 mV to 6.5 V.

Crossovers: The A and B sections also have independent crossover controls, each has:

  • Crossover Select Switch: three position switch; LPF (Low Pass Filter), Off (crossover is bypassed), HPF (High Pass Filter)
  • Frequency: continuously variable from 40 to 500 Hz

Connections

Power: The power and ground connections are set screw terminals that will accommodate up to 4-gauge wire. The included 3mm Allen wrench is used to tighten and loosen the terminals. Pioneer recommends different power and ground wire gauges based on the length of the wire:

  • 8-Gauge: up to 14' 9"
  • 6-Gauge: up to 23' 7"
  • 4-Gauge: up to 37' 5"

Remote Turn-on: The remote connection is a set screw terminal that will accommodate up to 8-gauge wire. The included 3mm Allen wrench is used to tighten and loosen the terminals.

Speaker Connections: The speaker output screw terminals will accommodate up to 8-gauge wire. The included 3mm Allen wrench is used to tighten and loosen the terminals.

Signal Input: The amplifier features two pair of stereo RCA inputs (A/B). If no line level signal is available, use the included speaker wire to RCA adapters.

RCA Output: The one pair of preamp output jacks provide a convenient way to daisy-chain an additional amplifier without running another set of RCA cables from the front of the vehicle to the amplifier location. The output is identical to the A channel input and is not affected by the internal crossover.

 

Product reviews from the Crutchfield Labs (what are the Labs?)

Video: 2013 Pioneer Car Amplifiers

Video: 2013 Pioneer Car Amplifiers

by Zak Billmeier
 
Video: 2013 Pioneer Car Amplifiers

Pioneer's versatile 2013 car amplifiers help you get needed power to your speakers and subs. They're compact, powerful, and even 1-ohm stable so it's easy to match subs.

 
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Pioneer GM-D8604 Reviews

Average Customer Review:

8 people say:

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5 out of 5

You can't go wrong!

Written By RodDogg, Omaha, Nebraska on Friday, August 15, 2014
 
I bought two of these to run my front stage and my 6 X 9's. my front stage consists of a six and a half inch two ways system made by Rockford Fosgate, accompanied by 4 inch midrange speakers made by JL Audio. The 6 X 9's are alpine type R. both amps are bridged. I needed amplifiers that would play relentlessly at high volume without overheating. These fit the bill!the sound quality, dynamic range, and signal to noise ratios are within acceptable limits. As a matter of fact, they sound as good as any amplifier I've ever heard, except for an old school Phoenix Gold MS-2250.at this price point, I would put this amp up against any amplifier!
Pros:
decent power, runs cool, sound quality, low distortion, and small footprint.
Cons:
power, ground, and remote is kind of difficult to connect. Also, the way in which you bridge these amps is a little unorthodox compared to typical designs.
Was this review helpful?    Yes | No
 
5 out of 5

Killa Amp

Written By Cadillac Rida, Bham Al on Thursday, June 12, 2014
Crutchfield Customer Review (What's this?)
 
This amp is perfect if u need plenty of power for door speakers but u have limited space. Packs a good punch. Sounds great on my pioneer 6 3/4 door speakers
Pros:
Good power. Does what the descriptions. Small for tight spaces
Cons:
None
1 out of 1 people found this helpful
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5 out of 5

great product

Written By errors, Dauphin, PA on Tuesday, April 01, 2014
Crutchfield Customer Review (What's this?)
 
Great product
1 out of 2 people found this helpful
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2 out of 5

lower end

Written By drock, Keller Texas on Wednesday, February 12, 2014
 
Can't handle high volume . I replaced a sound stream amp with same wattage. This amp does well at Low volume. Anything at mid volume up, the amp shuts down. In comparison, this amp is weak. Wish the sound stream would have not lost a channel! ??
Pros:
Simple install
Cons:
Can't handle volume
1 out of 5 people found this helpful
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5 out of 5

Pioneer GM-D8604

Written By Michael D, Belleville,NJ 07109 on Monday, August 12, 2013
Crutchfield Customer Review (What's this?)
 
Definitely made a tremendous difference in My trucks sound system. Music is crisp and clear. Really works well with my infinity speakers.
3 out of 4 people found this helpful
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5 out of 5

POWERFUL!!

Written By jb, Zachary, Louisiana on Tuesday, July 02, 2013
 
I chose this amp to run 2 sets of Polk db6501 components. Installed in a crew cab 2012 GMC Sierra with the stock head unit. I couldn't be happier! They make the Polk components really sing! It took a little tuning and head scratching to get the sound how I liked but now the sound is amazing! Running in 4 CH mode the gains are up only about a quarter of the way and that's all my ears can take. I just got finished running it really loud for an hour or so and it was barely warm to the touch. A++
Pros:
Runs super cool, perfect size. Take your time and install correctly.
Cons:
None
9 out of 10 people found this helpful
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5 out of 5

Great Amp

Written By Chris H., Raleigh, NC on Saturday, June 08, 2013
Crutchfield Customer Review (What's this?)
 
This is such a good amp. I have it powering 6.5 polk audio components in the front and 6x9's polks in the rear. It really brought my speakers to life. I can play them as loud as possible and get no distortion what so ever. Also the amp stays cool and is very small and light weight. Unlike the reviewer (Rando R, Shreveport La) i dont get any thumps at start up and i have no humming sounds at all. This was a great buy for me!
Pros:
Small, powerful and stays cool
Cons:
none
5 out of 5 people found this helpful
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4 out of 5

cool amp pioneer gm d8604

Written By Rando R, Shreveport La. on Sunday, March 24, 2013
Crutchfield Customer Review (What's this?)
 
Man o Man this is a great amp and small for the power it produces this thing has yet to get hot even at high power levels easy to install and is really a good looking unit.
Pros:
powerfull yet small runs cool even at high power levels looks good too.
Cons:
due to rca signal turn on circuitry in amp and CAN data network type accessory turn on trigger in OEM head amp turns on when doors are opened. Plus one nasty thump from speakers at engine start even with head unit off.
3 out of 7 people found this helpful
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2 questions already asked

Is it ok to put two kicker 10 inches subs 300watt each wit a 4channel pioneer 1200watt amp? [ h  Jul 25, 2014 ]
5 answers
  • Yes it would work. [ Cole   Jul 27, 2014 ]
  • I don't believe you would be satisfied with the output power on 2 10 inch subs. I have this amp bridged on 1 channel for a 10 inch JBL sub and using the other channel for infinity components. Sounds great but I personally feel the single sub is a bit underpowered. [ Steve   Jul 27, 2014 ]
  • Depends on the ohms of the speakers, how they are wired, how many watts the amps produces at certain ohms. Kinda a vague question. Need more details. [ Raymond   Jul 26, 2014 ]
  • Are you going bridge all 4 channels? Subs 2 or 4 ohm [ Larry   Jul 26, 2014 ]
  • Thanks for your question. For information on pairing amps with subs I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They will be able to help determine the differences between the amp models and help you make the best choice for your system. [ Greg Staff  Jul 26, 2014 ]
Can I connect a tube subwoofer with nomjnal input power of 300watt on bridged channel b of this amp? and front door speakers on channel a as well? [ George  Jul 17, 2014 ]
1 answer
  • George, It is doable. You need to have at least two sets of Pre-Amp outputs on your receiver, most will have three. I would hook up the sub-woofer first from your receiver to the amp and then to the sub and check to make sure it works properly. Then hook-up the front connection from your receiver to the amp and then connect your speakers. This should work. [ John   Jul 19, 2014 ]

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