Pioneer GM-D8604

600W Class FD 4-Channel GM Digital Series Amplifier

We apologize

This item has been discontinued

Get FAST answers from customers ASK a Question See questions answers

General Features:

  • GM Digital Series 4-Channel Class FD Car Amplifier
  • RMS Power Rating:
    • 4 ohms: 100 watts x 4 chan.
    • 2 ohms: 150 watts x 4 chan.
    • 1 ohm: 125 watts x 4 chan.
    • Bridged, 4 ohms: 300 watts x 2 chan.
  • Max power output: 600 watts x 2 chan.
  • Pulse Width Modulated MOSFET power supply
  • LED power (green) and protect (red) indicators
  • 4/3/2 channel operation
  • Preamp RCA outputs to daisy chain multiple amps
  • 3-way protection circuitry (thermal, overload, and speaker short protection)
  • High-density split-dome convection heat-sink for extreme heat dissipation
  • Nickel-plated RCA level inputs
  • Nickel-plated screw terminals
  • Input sensitivity:
    • Low level: 200mV-6.5V
    • High level: 0.8V-16V
  • Variable high-pass filter (40-500 Hz, 12 dB/octave)
  • Variable low-pass filter (40-500 Hz, 12 dB/octave)
  • CEA-2006 compliant amplifier
  • Frequency response: 40-50,000 Hz
  • 4 gauge power and ground wiring is required for installation. Contact us for information regarding a discount on select amplifier kits from our website when purchased together with this amplifier.
  • Dimensions: 10-7/16"W x 2-3/8"D x 7-7/8"H
  • 1-year Sonic Electronix Warranty


Second Depth
The second depth is used only when the box is slanted or angled. This value is the top measurement and it is measured in inches.
The front-to-rear depth of the item, in inches. If the item is angled or slanted, this value is the bottom measurement.
The height of the item, measured from top to bottom, in inches.
The width of the item from left to right (side-to-side) measured in inches.
Color of handle.

Warranty and Return Policy

Parts Warranty Duration
90 days
Labor Warranty Duration
90 days
Warranty Provider
Sonic Electronix

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
4 Star
3 Star
2 Star
1 Star

Average Attribution Rating

Browse 20 questions and 85 answers
Hide answersShow all answers | Sort by
Why did you choose this?
Sonic Electronix Store
I heard it was good clean amp
Marcus D on Nov 28, 2017
pioneer is the best option in car audio amplifiers
Favio M on Jul 16, 2017
looking for a affordable replacement for my failed alpine. Easy to install.
David B on Sep 24, 2017
Good Brand
Mascelles m on Jun 13, 2017
I have a Pioneer GM D9601, GM D8601, and two GM D8604, what would be a good amp wiring kit that will power these amps sufficiently?
Xerxes on Jun 24, 2015
Pioneer GM-D8604
Pioneer GM-D8604
Pioneer GM-D9601
Pioneer GM-D9601
Pioneer GM-D8601
Pioneer GM-D8601
Best Answer: I don't think they make a good enough wiring kit. You'll have to make your own. I bought 20' of power & ground (0gauge) wire from NVX. I ran that to their distribution blocks. Then used their 4 gauge wire to hook up 2 gm-d9601 & a gm-d8604. I fused it with a kicker 300amp fuse before the block & a 200amp fuse to each amp after the block. No troubles with wiring heating up & everything works great. NVX big 3 bundle is also good. Have the xs-d3400 under the hood & eventually a xp series battery in the back.
Reply · Report · Adolfo A on Jun 24, 2015
· Add Answer · I Have This Question Too (1)
how at 2 ohms its 150rms but at 1 ohms its 125rms?
taylor y on Aug 29, 2014
Best Answer: Normally you're right...power output does increase as impedance (ohms) drops. Yours are the same specs that Pioneer gives on their site. The best explanation I can find is in the last sentence of the following paragraph. Hope this helps. ((( High Current Amps:
Many people think that a car audio amplifier has to be bridged into a low impedance load (2 ohm mono) in order to produce a lot of power. Well, this isn't necessarily true. Some large high current amplifiers are designed with a relatively low rail voltage. These amplifiers would need a low impedance load (2 ohm mono or 1 ohm stereo) to produce their maximum power output. Other amplifiers have a relatively high rail voltage and will produce full power in a higher impedance such as 2 ohm stereo or 4 ohm mono. There is no impedance which can be considered best for all amplifiers. You must know what the amplifier was designed for, to know what load will produce the most power output. ))) Looks like this amp was designed to make max. power @ a 2 Ohm load. I can tell you that I connected this amp to (4) Pioneer TS-D6802R speakers, 1 on each channel, 2 in front doors and 2 in rear xtra cab side panels and it sounds incredible!!! The amp runs cool... One of the best setups I've ever seen at this price level! Don't skimp on wire, get heavy enough wire for all connections!!! Very important!!
Reply · Report · Steven K on Aug 30, 2014
· Add Answer · I Have This Question Too (1)
I want to connect 2 component speakers running at 90 watts rms each at 2 ohms on channel A which is channel 1 and 2. Then I want to bridge channels 3 and 4 to get the 300 watts rms at 4 ohms but I'm confused on connecting channel B at 4 ohms to 2 x 4 ohm subs. I need help? I want to connect two speakers and 2 subs. I need to know what kind of subs to get like for example: Do I get 2 x 4ohm DVC and wire and bridge channels 3 and 4 on the amp? I'm not sure which ohm load and if svc or dvc to get?
ep712 on Jan 25, 2016
Best Answer: Hello,

Bridged, 4 ohms: 300 watts x 2 chan. isn't very much power in and of itself. Divide that into two subwoofers, and you will only be getting ~150w RMS to each subwoofer. This might be what you're looking for, but based on you confusion, we fear that this may not be the performance you seek. Feel free to correct us :) . Now, to the have a few options - neither is "better" than the other, they are all the same, just different configurations.

1A) Two Single 2ohm subs. - (Easiest) Here, you can give each sub its own channel

1B) OR you can wire them in series and bridge the amp...this would be pointless and more work than needed, as you are getting the same result as option 1A, but it is up to you.

2) Two Dual 4ohm subs. - Here, you wire the subs in series/parallel and bridge the amp.

3) Two Single 8ohm subs - Here, you wire the subs in parallel and bridge the amp.

Obviously, whatever subwoofer you chose, must only need ~150w rms. (e.g. Two 150W RMS Single 2ohm subs).

We highly recommend seeking a professional installer if this still goes over your head, OR ask us to elaborate on ONE of the above.
Reply · Report · Rick MStaff on Jan 25, 2016
· Add Answer · I Have This Question Too (1)
Are the RCA connections SE Single Input or Differential Input on GM-D8604?
Todd H on Jul 14, 2015
Best Answer: Sorry, 1st answer didn't post. They are single ended (SE). A test on my amp with an ohm meter indicates continuity between the RCA shield and the vehicle ground. This would not be the case if they were differential inputs. I used good quality coaxial RCA patch cables and have ZERO noise. More important to separate your power and speaker wiring and route them away from existing vehicle wiring than to insist on differential inputs, also never coil up extra wire. Try to use proper lengths. Fold it back on itself if you have to, NO COILS!!! I love this amp. It powers (4) Pioneer TS-D6802R speakers, sounds awesome!!! Hope this helps, Steve
Reply · Report · Steven K on Jul 15, 2015
· Add Answer · I Have This Question Too (0)
Can someone suggest which is the right one to go for out of Pioneer GM-D8604, NVX JAD800.4 or PPI 900.4 in terms of sound quality and reliability?
Omair K on Mar 22, 2017
Pioneer GM-D8604
Pioneer GM-D8604
Crunch P900.4
Crunch P900.4
NVX JAD800.4 Open Box Complete
NVX JAD800.4 Open Box Complete
Best Answer: Can't comment to the NVX or Pioneer, but I have 2 PPI 900.4's that sound clean and have been rock solid. Frankly, I think most modern amplifiers from reputable companies produce sound of high enough quality that even the most discerning of ears couldn't tell the difference (particularly in an automobile). Get the amp that has the features you want (I picked the PPI for its power rating and the on-board crossovers as it simplified my 3-way front stage). Best of luck!
Reply · Report · Terry O on Mar 22, 2017
· Add Answer · I Have This Question Too (0)
what guage speaker wire for this amp?
A shopper on May 20, 2015
Best Answer: I use 12 AWG, and it works great. The amp will accept I think 10 to 18 and be okay. Just be careful using a smaller wire with a higher power output amplifier! When in doubt, use the heavier wire.
Reply · Report · Jacob H on May 21, 2015
· Add Answer · I Have This Question Too (0)

I have read a lot reviews about Pioneer GM-D8604 my question is can i hook up this amp to mitsubishi galant 2010 with out rock ford kit ?. do you think the car alternator supports the amp ?Please guide me.
Thank you.
jayendra v on Jan 15, 2017
Best Answer: Thank you, i would like to fix it on factory oem head unit with line out put controler preferably NOXPLOC4 .the amp would be the same and would like to hook front 2 component speakrs with 100 rms out put each and at the rare 2 coaxial speakers 100 rms each.And fix with sound dampening. do you think this gives me a descent sound.
Reply · Report · jayendra v on Jan 18, 2017
· Add Answer · I Have This Question Too (0)
Would like to run this amp on my motorcycle. Yamaha royal star venture. what do you suggest?
A shopper on May 6, 2017
Best Answer: Ive had a lot of luck with this amp. It packs a lot of power in a small package. I'm running four 6.5 inch speakers paired with one kicker solo baric 12inch (running at 750rms) and this has no trouble keeping up. I have no doubt that this will give you plenty of quality sound over all of that wind noise!! best of luck
Reply · Report · james f on May 8, 2017
· Add Answer · I Have This Question Too (0)
Can this amp do 2 ohm on 1 channel and 4 ohm on another channel????
Sambath K on Apr 10, 2016
Best Answer: Hi there,

This Amp cannot run different channels at different Ohms.
Reply · Report · Nicky Patel on Apr 11, 2016
· Add Answer · I Have This Question Too (0)
I got another question. Can you have multiple ohms at the same time? For instance, channel 1 and 2 at 4 ohms and the other two at 2 ohms. Or three at 4 ohms and one at 2 ohms.
taylor y on Sep 1, 2014
Best Answer: Yes. For example, if you are running your front speakers off channels 1 and 2 at 4 ohms and are bridging channels 3 and 4 for a subwoofer (also at 4 ohms), channels 3 and 4 actually see 2 ohms each. If you are running regular speakers off of all four channels, note that the lower impedance channels will see more power than the other channels (and typically produce more volume), given the same gain setting. But it is perfectly fine to do this.
Reply · Report · Brenton R on Sep 10, 2015
· Add Answer · I Have This Question Too (0)
I'm thinking of running Polk MM571's in the front doors and Rockford Fosgate T-1682 Power's in the rear....The Polks are (3) ohm and the Rockfords are (4) ohm....Is this a problem???
Randy B on Jun 22, 2016
Best Answer: The amp is stable down to 2 ohms so there is no problem there. Running different olm loads on the amp can make it wear a little faster but nothing extreme. I ran 2 olm fronts and 4 olm rears for a little over a year before switching speakers, the amp is still running strong.
Reply · Report · Eric D on Jun 22, 2016
· Add Answer · I Have This Question Too (0)
Is it possible to run 2 4 ohm subs on this amp? They are 200w RMS
Jake C on Jun 15, 2015
Best Answer: Hello Jake,

We HIGHLY recommend going with a monoblock, which are intended for subwoofers, especially if you aren't familiar with car audio set ups. However, this amplifier can be Bridged to 4 ohms providing 300 watts x 2 chan, making it fairly ideal for two Single-4ohm drivers asking for >200w . Give our sales team a call for further assistance.
Reply (1) · Report · Rick MStaff on Jun 15, 2015
· Add Answer · I Have This Question Too (0)
can i hook up two pioneer GM-A6604 using both amps speaker level inputs wiring them both to my pioneer headunit or will it be to much for the headunit?
kurt t on Dec 6, 2014
Best Answer: Hello,

The system will work, in theory. The problem here is, that you will be Splitting the signal, and therefore dramatically degrading the overall performance. I suggest researching the Audiopipe SPLIT-3003. That will allow you to go from One Full Set of RCAs, and Properly Splitting to three Full Sets of Outputs . In addition, this unit will also act as a line driver, so you DO NOT lose the quality of the signal, from splitting it.

Reply · Report · Customer SStaff on Dec 6, 2014
· Add Answer · I Have This Question Too (0)
can I bridge channel 3 and 4 to get 200 watts rms at 4 ohms? and still keep channel 1 and 2 the same.
A shopper on Dec 15, 2017
Best Answer: I believe so folk
Reply · Report · JEFFREY T on Dec 15, 2017
· Add Answer · I Have This Question Too (0)
Is the Amp Pioneer GM-D8601a good match with the subwoofer Pioneer TS-W106M?
A shopper on Dec 16, 2016
Pioneer GM-D8604
Pioneer GM-D8604
Pioneer TS-W106M
Pioneer TS-W106M
Best Answer: It could power that sub, but it would be kind of a janky setup as far as wiring goes. While that amp can be used to power one sub, it's truly meant to power 4 door speakers. I'd recommend its equivalent monoblock, the GM-D8601. Much simpler wiring, and will be doing the job it's meant for! I personally use the larger version, the GM-D9601, for my setup, and I love it.
Reply · Report · Jacob H on Dec 16, 2016
· Add Answer · I Have This Question Too (0)
I would like to use this amp with a 2014 Honda Accord OE head unit using high level input. What is the best solution for no remote or power antenna turn on lead with my factory head unit? Is it best to look for an amp with auto sensing on the high level inputs? Any advice would be great, thank you.
Andrew J on Dec 15, 2016
Best Answer: This amp has Speaker Line Input Turn-On Sensor so you would not have to run a remote turn on lead from a high to low level adapter. As long as you tap into the speaker wire leads with the supplied high to low adapters it will automatically turn the amp on.
Reply · Report · Cesar V on Dec 15, 2016
· Add Answer · I Have This Question Too (0)
I was wanting to connect this amp to four door speakers in my car, but I do not want a head unit. I wanted to run an aux cord to the amp connected to my phone, but I see that there are two input channels (A and B), so if I connect my rca-to-aux to one of the channels, the other channel will not receive sound? Or will I need an rca splitter? Thanks!
keegan m on Jun 6, 2016
Best Answer: Hi Keegan,

Due to various voltage variables we can't guarantee that your output is going to be on par with what you expect. Moreover, we DO NOT suggest splitting the signal with a splitter; doing so will Also split the quality of the signal you are sending, which we've already said is a variable we can't determine. Instead, we suggest sending the signal to something like the NVX XEQ7, which can take your ONE output, even with an auxiliary source (like your device), and provide you with all the outputs you need:
Reply · Report · Rick MStaff on Jun 6, 2016
· Add Answer · I Have This Question Too (0)
I want to connect the amp to both my head unit (speaker-level out) as well as my Hi-res portable media player (line out level). Are there any input selector to mount on the dash to switch between inputs?
My head unit has no AUX in.
Nguyen T on Apr 4, 2016
Best Answer: Hello,

There is no such switch for that specific purpose. However, we suggest taking a look at the Clarion EQS746, which will give you the ability to include an auxiliary source to the system. The draw back here is that you will - obviously - need to find a place to install it.

Alternatively, you can use a universal Auxiliary Integration kit, but these tend to degrade the quality of the audio: EX,
Reply · Report · Rick MStaff on Apr 4, 2016
· Add Answer · I Have This Question Too (0)
The whole point of buying this amp is so that I can power my infinity kappa 60.11cs component speakers. They are 90 watts rms @ 2 ohms each and I have two. I would wire them separately to channels 1 and 2 and get 150 watts rms @ 2 ohms to them each. I know that is a lot of watts but I read you can over power your speakers up to 150% which would be 135 watts rms so I'm only over by 15 watts rms. Ok the other reason I want to buy this pioneer amp is because I want to put 2 x 8" subwoofers at 150 watt rms each then I would bridge them to channel B which is channels 3 and 4 at 4 ohms. The main reason is I don't have a lot of room behind the back seat of my pickup truck to fit a big subwoofer box and secondly I don't want to buy a second amp and also the infinity kappa speakers are really nice but don't offer the low bass. so if this helps to clarify my answer I would like to know the best 8" subs to get to do what I'm looking for. Thanks. I just need to know what 8" subs to buy to work with this amp for example: do I buy 2 8" DVC 4 ohm subs at 150 watt rms each? I hope this helps and thank you for your time.
ep712 on Jan 25, 2016
Best Answer: Hi Erik,

The previous reply stands as true.

1A) Two Single 2ohm subs. - (Easiest) Here, you can give each sub its own channel

1B) OR you can wire them in series and bridge the amp...this would be pointless and more work than needed, as you are getting the same result as option 1A, but it is up to you.

2) Two Dual 4ohm subs. <--- Yes, you can do that.

3) Two Single 8ohm subs
Reply (1) · Report · Rick MStaff on Jan 25, 2016
· Add Answer · I Have This Question Too (0)

Product Summary


Model Number




Internal SKU


Internal Product ID


Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Pioneer GM-D8604