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Pioneer GM-DX874 4-channel car amplifier — 100 watts RMS x 4

Item # 130GMDX874

Pioneer's handsome GM-DX874 four-channel amplifier will deliver 100 watts RMS to each of your front and rear...

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Pioneer's handsome GM-DX874 four-channel amplifier will deliver 100 watts RMS to each of your front and rear...

16 questions - 22 answers

Item # 130GMDX874

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About the Pioneer GM-DX874

Buck Pomerantz

Cool power

Pioneer's handsome GM-DX874 four-channel amplifier will deliver 100 watts RMS to each of your front and rear speakers, for powerful music that'll make every ride a pleasure. 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. The frequency response of this amplifier stretches up to 50,000 Hz, so it'll support crystal-clear, Hi-Res playback. Pioneer uses high-grade electronic parts and gold-plated RCA connections to ensure maximum performance.

Cool power

Pioneer's handsome GM-DX874 four-channel amplifier will deliver 100 watts RMS to each of your front and rear speakers, for powerful music that'll make every ride a pleasure. 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. The frequency response of this amplifier stretches up to 50,000 Hz, so it'll support crystal-clear, Hi-Res playback. Pioneer uses high-grade electronic parts and gold-plated RCA connections to ensure maximum performance.


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 a separate amplifier for your sub, and switch this amp over to run all four of your full-range speakers.

Connections and tuning for all occasions

Speaker-level inputs allow you to install this amp in a factory system with no RCA connections — the amplifier switches its input mode automatically when it detects the high-level signal, eliminating the need to run a turn-on lead to your receiver or fuse box. Built-in high- and low-pass filters let you adjust the sound for your vehicle's interior, whether you're driving speakers or subs.


Product 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)
  • CTA-2006 compliant
  • full-range Class D amp technology
  • frequency response: 10-50,000 Hz (Hi-Res capable)
  • variable high- and low-pass filters (40-500 Hz, 12 dB per octave)
More Features:
  • wired remote controls variable bass boost (0-18 dB at 50 Hz)
  • preamp inputs and outputs
    • gold-plated RCA connections
  • speaker-level inputs via supplied RCA-type adapters
    • signal-sensing turn-on with speaker-level inputs
  • wiring and hardware not included with amplifier
    • 4-gauge power and ground leads recommended
  • fuse rating: 30A x 2
  • dimensions: 10-3/8"W x 2-3/8"H x 7-7/8"D
  • warranty: 1 year
  • MFR # GM-DX874

What's in the box:

  • 4-Channel amplifier
  • Two 30-amp ATO fuses (installed)
  • Two 8" Speaker wire to RCA input adapters
  • Wired Bass Boost Remote
  • 16' Bass Boost Remote cable (RJ-14 plug on both ends)
  • Four 3/4" Screws
  • Two 3/8" Screws
  • 3mm Allen wrench
  • Owner's manual (English/ French)
  • Owner's manual (Spanish)
  • Warranty information

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4.5 out of 5 stars
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More details on the Pioneer GM-DX874

Mark G.

Product Research



CEA-2006 Compliant: CEA-2006 is a system of testing and measurement for mobile audio amplifiers. This voluntary standard advocates a uniform method for measuring an amplifier's RMS power output. The criteria for measuring power uses a DC input voltage of 14.4 volts and the RMS power output is measured over a frequency range of 20 Hz to 20 kHz (for full range amplifiers), with 1% or less Total Harmonic Distortion plus noise (THD+N). CEA-2006 standards allow consumers to compare car amplifiers and receivers under the same conditions (apples to apples).

CEA-2006 Specifications:

  • Power Output: 100 watts RMS x 4 into 4Ω
  • Signal to Noise Ratio: 75 dBA (measured at 1 watt into 4Ω)

Other Specifications: (not using the CEA 2006 criteria)

  • Power Output:
    • 150 watts RMS x 4 into 2Ω (at 14.4 volts, 1 kHz, <1% THD)
    • 125 watts RMS x 4 into 1Ω (at 14.4 volts, 1 kHz, <1% THD)
    • 300 watts RMS x 2 (bridged) into 4Ω (at 14.4 volts, 1 kHz, <1% THD)
    • 250 watts RMS x 2 (bridged) into 2Ω (at 14.4 volts, 1 kHz, <1% THD)
  • Signal to Noise Ratio: 95 dB (at rated power output)
  • Distortion: 0.05% (measured at 10 watts, 1 kHz)

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 compact design provides many installation options.

Channel Layout: The GM-DX874 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. This eliminates the need for running a system remote control wire (turn-on lead).


Input Select: The amplifier has an input select switch, allowing you to choose the preferred input mode:

  • 4 Channel: A channel and B channel inputs connected
  • 2 Channel: only the A channel inputs are connected

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. When you use a speaker level input, the gain control range is from 800 mV to 16 V.

Crossovers: The A and B amplifier sections also have independent crossover controls. Each can be set to Low Pass, High Pass, or Off (Full Range). The rotary frequency controls let you set the crossover point between 40 Hz and 500 Hz. The crossover slope is 12 dB/octave.

Remote Bass Boost Control: The included Remote Bass Boost control module lets you adjust the amount of bass boost (output by the B channels) from the front of the vehicle. The Bass Boost circuit is centered at 50 Hz, with a variable boost level of 0 dB to 18 dB. Module dimensions:

  • Width: 1¾" (2⅝ including the mounting tabs)
  • Height: ⅝"
  • Depth: 1⅝" (2⅛" including knob and wiring)

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/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"
Note: The amplifier has two 30-amp fuses installed and Pioneer recommends an 80-amp fuse in-line within 12" of the battery.

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/loosen the terminals.

Speaker Connections: The speaker output screw terminals will accept up to 8-gauge wire. The set screws are tightened/loosened with the included 3mm Allen wrench.

Signal Input: The amplifier has two pair of stereo RCA inputs, labeled Channel A and Channel B. If no preamp level signal is available use the included speaker level to RCA adapters.

RCA Output: One pair of preamp output jacks provides 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.

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Customer Q&A

16 questions already asked

What is the RCA output jack for? Is it to provide signal to another amp? Like maybe audio signal to a separate mono amp?
stony  Oct 23, 2023
1 answer
Correct! This would be a common use for the RCA outputs available on this amplifier.
zachary  Oct 23, 2023 (Staff)
I don't understand how to set the gain on the Pioneer GM-dx874 I've never seen an amp with this kind of gain. Can you help please?
varrone  Apr 19, 2023
1 answer
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the settings on the product. Our toll-free Tech Support number is printed on your invoice and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer.
andrea  Apr 19, 2023 (Staff)
What is the difference, if any, between this Amp (GM-DX874) and the GM-D8704?
robert  Mar 18, 2023
1 answer
Greetings Robert, and thank you for your question. Without having both here, its hard to tell. You can compare both on the Pioneer site, and from what I could see is the GM-D874, and the GM-D8704 look identical.
hogan  Mar 18, 2023 (Staff)
Will this amp work for my Kicker 47KSC6504 and the 47KSC6704? Their both rated 100 Rms.
chris  Feb 02, 2023
1 answer
This could be used with either model of Kicker speaker.
zachary  Feb 02, 2023 (Staff)
Will this amp work with the MTX Audio Terminator Series TNE212D? I also installed the Focal RSE-165 speakers and was wondering if they could run on this amp as well.
isaac  Dec 13, 2022
1 answer
The Fantastic Focal RSE-165 speakers are rated for 60-watts RMS, so this Pioneer amp is just a tad too powerful Isaac. This amp also will not drive any subs and is just designed for full-range speakers. The Infinity Reference 7005A in the first link below would be a great choice to power full-range speakers and the MTX dual sub box. The 5-channel version of the GM-DX975 4-channel in the second link would also be an awesome choice to power the Focals and the sub box. I hope this helps!
bo  Dec 13, 2022 (Staff)
When running this amp with a LC2i, does the amp still recognize the RCAs from the LC2i as a speaker level input? Or would I have to run a remote wire from the LC2i (remote out) to the amp?
keith  Dec 03, 2022
1 answer
You will need to run the 12V lead generated from the Audiocontrol's GTO feature to turn on the Pioneer amp, Keith. If you are using the LC2i's full range output, also don't forget to switch this Pioneer powerhouse into 2-channel input mode. Personally, these Pioneer Limited Edition amps are some of my favorites in my own builds!
bo  Dec 03, 2022 (Staff)
When using as 3 channel (1 channel Rear "B" Bridged for sub (mono) and 2 channels for Front "A" L/R front full range (stereo)) what would RMS BE for the sub and for each front speaker? IF I ran four speakers to the two front "A" channels with the above config. for the 3rd rear "B" channel, would RMS per speaker change? And last (although I have no idea why anyone would do this) if config as 2 channel bridging B as above and also bridging A, but still connecting 2 front speakers???what would RMS per speaker be?
deb7308  Nov 07, 2022
1 answer
Greetings Deb7308, and thank you for your questions. As is with two 4ohm speakers off the front channels, the amp has 100 watts per channel. Bridged rear channels will have 300 watts at 4 ohms. Your sub/subs would have to be presenting a 4 ohm load to the amp, not lower. If you ran 4 speakers off the front channels, and all 4 were 4ohms, the amp runs those channels at 2 ohms, puts out 150 watts and divide that by two pairs of speakers (75 watts each). Bridging fronts as well would be 300 watts, it then would not be stereo left and right, but mono. It also would only be 4 ohm stable. That configuration is almost never used for full range speakers, but can be for just running all subwoofers.
hogan  Nov 07, 2022 (Staff)
Is there a significant reason this amplifier is so cheap given that it???s running 100 watts for 4 channels? Is it quality clean power?
cesar  May 13, 2022
1 answer
You can get barely audibly clearer sound from a JL Audio amplifier (in my past car stereo days). But this is a really good amplifier.. and even better for the price. I am extremely impressed. It may suffer a little on clarity at top volume on the knob... but that could also be my speakers.
roger  May 16, 2022
Need a replacement remote bass control knob for this amp ?? Wasn't in the box, just the cable
kevin  Jul 11, 2021
1 answer
We do not offer the remote separately from the amp. If it was purchased from Crutchfield, I recommend contacting our technical support to see if we have any way to help. We include their toll free phone number on the order invoice. If it was purchased elsewhere and they cannot help, we recommend contacting Pioneer parts by calling 800-228-7221 to see if they can supply you with one.
jason  Jul 17, 2021 (Staff)
Does this amp have differential-balanced inputs?
jose  May 24, 2021
2 answers
Having tested this amplifier with a multimeter, I would guess that it is, but not a 100% surety, as Pioneer doesn't specify, and the test rating is lower than guaranteed differential models I have tested as well. While rated to except high voltage input sources similar to other true differential amplifiers, it's also a common practice for some companies to skip the additional cost in manufacturing and simply rely on single ended input for cost savings. This is the best I could offer without contacting Pioneer directly to speak with an expert. Hopefully this'll help you.
bradlee  Dec 29, 2021
We have not received any answers from other customers on your question. I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They should be able to help answer your question.
thomas  Jun 08, 2021 (Staff)
I'm looking to buy this amp. I'm going to be running a pair of Pioneer TS-Z65CH and a single Pioneer TS-Z10LS4. If I run the 6.5's off the front 2 channels, and bridge the rear channels to 1, will this setup be sufficient?
brett  Dec 01, 2020
1 answer
Based on the reviews and specs of the amp , you should do just fine as others are using channels 1&2 to power a set of pair of front speakers/ components and channels 3&4 bridged together to power a single subwoofer with a 4 ohm load.
yoshimar garcia  Dec 01, 2020
Hi! I have two sets of the Pioneer Component System Pioneer TS-Z65CH, which I understand have around 110Watts RMS @ 4Ohm each speaker (I'm still not clear if the RMS shown is for the complete set or for each speaker). But I'm wondering if with this Amplifier it would be ideal to connect each speaker individually to each channel (Having 100watts per channel at 4ohm), or if it would be better to bridge two channels to have 300Watts @ 4Ohm and connect front speakers together (for a total of 220watts @4ohm) and rear speakers together?
sonis  Nov 13, 2020
2 answers
10w of power isn't a big loss if you decide to run each channel @ 4ohms for the given 100w x 4. However, if you do decide you want more power, than I would recommend bridging the amplifier for 2 channels, and connecting 2 speakers to each channel in a parallel configuration. This should give you a theoretical wattage of 125w per speaker @ a 2 ohm load. While this may seem slightly over the RMS rating of the speakers, you can compensate using a multimeter, to test the output voltage range when dialing in the gain level by having it turned slightly lower than normal. If you are unsure about how to do this, than I would stick with the 100w x 4 or consult the help of an expert.
bradlee  Dec 29, 2021
I have the setup with 4 speakers 2 Front and 2 Rear, With 2 Left and 2 Right connected to their respected amp outputs, so no bridging and it sounds great.
jon  Nov 13, 2020
What is a good subwoofer with this amp?
phil  Aug 22, 2020
2 answers
JL audio
jorge  Aug 22, 2020
This isn???t a ???subwoofer amp??? because it is 4 channel. This amp would be good for 4 small component speakers/tweeters. You want a mono channel amp separate for your subwoofer.
devin  Aug 22, 2020
Can I install 4 speakers with less than 100w rms (4ohm), like 90w rms each to this amp, or the speakers to this amp need to be with more wattage than the amp per channel?? It still confuses me...
nuno  Feb 29, 2020
3 answers
Technically yes, but it would require someone experienced in proper testing of the relative voltage output in comparison to the input signal setting. In other words, it can be dialed down slightly, but at the possiblity of losing some volume.
bradlee  Dec 29, 2021
Hi Nuno. We do not recommend exceeding the RMS power rating set forth by speaker manufacturers. Please chat with an Advisor online or by phone at 1-800-324-9695. We will be happy to help you find an amplifier that would be more suited for your application.
jessica  Apr 01, 2020 (Staff)
Ideally you want speakers that have a higher rms watt rating to prevent speaker damage at higher volumes.
joseph  Mar 27, 2020
If I bridge 2 channels and leave the other 2 channels independent to power component speakers, would I switch the input select to ???2 channel??? or ???4 channel????
ken  Nov 11, 2019
1 answer
Hi Ken, thank you for your question. If you plan on bridging 2 channels, and then running 2 sets of components on the other speaker channels, you would need to switch the input select to 4 channel. Any member of our Advisor team will be more than happy to help answer any questions you may have on this amp, so feel free to chat with us online or by phone at 1-800-324-9695.
jessica  Nov 21, 2019 (Staff)
What???s the big differences between the GM-D8604 and the GM-DX874?
joshua  Feb 12, 2019
2 answers
There may be other differences, but besides the fact that one is available and the other one is not, the new one has bass boost and controller. The previous model does not.
kevin  May 12, 2020
Thanks for your question. For information on comparing two or more models 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 and help you make the best choice for your system and your budget.
kristina  Feb 14, 2019 (Staff)

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