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Pioneer GM-A4704

4-channel car amplifier — 40 watts RMS x 4

Item # 130GMA4704

Why put an amplifier in your car? Pioneer's GM-A4704 4-channel amplifier will greatly improve the sound quality in...

Why put an amplifier in your car? Pioneer's GM-A4704 4-channel amplifier will greatly improve the sound quality in...

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About the Pioneer GM-A4704

Plays loud and clear

Why put an amplifier in your car? Pioneer's GM-A4704 4-channel amplifier will greatly improve the sound quality in your vehicle, so you'll find yourself looking forward to your time on the road. This punchy Pioneer will power your front and rear speakers with 40 watts RMS each, which is actually a large jump over the power supplied by a typical car radio. You'll hear much more of the little details in your music, especially when you turn your system up to overcome road noise.

Plays loud and clear

Why put an amplifier in your car? Pioneer's GM-A4704 4-channel amplifier will greatly improve the sound quality in your vehicle, so you'll find yourself looking forward to your time on the road. This punchy Pioneer will power your front and rear speakers with 40 watts RMS each, which is actually a large jump over the power supplied by a typical car radio. You'll hear much more of the little details in your music, especially when you turn your system up to overcome road noise.

4-channel versatility

Here's why lots of people start building their systems with a 4-channel amp. You can run your front speakers with the front channels (A) on this Pioneer, then combine the rear channels (B) to drive a subwoofer. Then, when you've got enough cash to buy a second sub and a dedicated amp for your bass, you can use your 4-channel to run all your speakers. You can also put this versatile amp into 2-channel mode to send up to 130 watts RMS each to a couple of component speakers or subwoofers.

Tone controls

The front channels sport variable high-and low-pass filters so you can better adjust the sound for critical front soundstaging or a finely-tuned bass. Switchable high- and low-pass filters on the rear channels help take the rumble away from full-range speakers or the sizzle away from a sub. Speaker-level inputs allow you to add the GM-A4704 to a factory system. If your vehicle needs a sonic upgrade, this amp's performance features and reasonable price make it a great choice.

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Product highlights:

  • 4-channel car amplifier
  • 40 watts RMS x 4 at 4 ohms (65 watts RMS x 4 at 2 ohms)
  • 130 watts RMS x 2 in bridged mode (4-ohm stable in bridged mode)
  • CEA-2006 compliant
  • Class AB amp technology
  • variable high-pass (40-500 Hz, 12 dB/octave) and switchable low-pass (80 Hz, 12 dB/octave) filters on A channels
  • switchable high- and low-pass filters (80 Hz, 12 dB/octave) on B channels
  • preamp and speaker-level inputs
  • fuse rating: 30A x 1
  • 10-gauge power and ground leads recommended — wiring and hardware not included with amplifier
  • 12-1/16"W x 2-3/8"H x 8-1/2"D
  • warranty: 1 year
  • Our 60-day money-back guarantee
  • MFR # GM-A4704

What's in the box:

  • 4-Channel amplifier
  • 30A ATO fuse (installed)
  • Speaker-level input harness with eight 4" wires
  • 4 Self-tapping screws (3/4" length)
  • Owner's Manual (Eng / Fren)
  • Owner's Manual (Span)
  • Warranty sheet

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Pioneer GM-A4704 reviews

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Pioneer GM-A4704

Crutchfield customer from Detroit, MI on 9/8/2019

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I love it Just what I want

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0 of 0 found this helpful

Awesome 4 Channel Amplifier

Crutchfield customer from Memphis, TN on 8/24/2019

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Fantastic 4 Channel Amplifier! This has been the perfect addition to my car sound system. I purchased a Pioneer AVH-1550NEX, which initself is a fantastic Mulitimedia DVD Receiver with incredibly rich full sound, so I was skeptial about even needing a amplifier. Boy I'm glad the Crutchfield team explained how it would make a great sounding system go over the top! It's simply the best. I'm so glad I made the investment.

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2 of 2 found this helpful

Great Amp

Franky from Dover, DE on 8/11/2019

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Installed this amp yesterday to power two Pioneer TS-A6970F 6x9s in my 2017 Chevy Sonic and the sound is amazing, couldn't be happier with the results, Crutchfield recommends 10 gauge power wire but I went with 8 gauge power wire and seemed to be working good, ran amp hard for a couple hours with no issues, great amp for the money and had all the tuning settings you need to get the perfect sound. Definitely recommend this amp.

Pros: Affordable

Cons: None

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1 of 1 found this helpful

Pioneer GM-A4704

Crutchfield customer from Benton, AR on 8/8/2019

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Works perfectly, sounds great, easy to install.

Pros:

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1 of 1 found this helpful

Great for the price

Crutchfield customer from Hackettstown, NJ on 7/2/2019

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If paired with the correct speakers, this amp does the job and sounds amazing. Lifts the music from the floor to right spot in the car! Sounds great!!!

Pros: Just the right amount of power

Cons: Wish there were more settings to finely tune the highs and lows

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2 of 2 found this helpful

Nice amp

Crutchfield customer from Bridge City, LA on 5/13/2019

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Nice amp,really enhances the sound and gives you lots of options

Pros:

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2 of 2 found this helpful

Pioneer GM-A4704

Kevin from Yukon, OK on 3/10/2019

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Good amp for the $.

Pros:

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1 of 1 found this helpful

Pioneer AMP

Crutchfield customer from Deltona, FL on 1/11/2019

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This AMP really wakes up my POLK speakers

Pros: Very good quality

Cons: NONE

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3 of 3 found this helpful

Pioneer GM-A4704

Crutchfield customer from Nesbit, MS on 10/2/2018

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Just what I needed... a decent system to replace failed stock system in my truck

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4 of 4 found this helpful

Pioneer GM-A4704

Crutchfield customer from Eleele, HI on 8/29/2018

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A good amp for the price!

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Cons:

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4 of 5 found this helpful

Pioneer GM-A4704

Crutchfield customer from Ciales, PR on 8/20/2018

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Great

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2 of 3 found this helpful

Pioneer GM-A4704

Brett from Killdeer, ND on 8/19/2018

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Crutchfield makes the do it yourself installment a breeze. They are very knowledgeable and take the time to make sure you have everything you'll need. Their technicians are patient and will dedicate as much time that is needed to be sure you understand

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Crutchfield response on

7 of 8 found this helpful

Great value

Shawn from Parma, OH on 8/8/2018

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Nice amp. Easy to install. Makes a big difference. Not trying to shake the Earth, but a huge improvement when upgrading from stock. Using to power 6 1/2 door speakers, and 6x9 deck speakers.

Pros: Easy to install. Inexpensive for four channel amp.

Cons: None yet.

Crutchfield response on

11 of 11 found this helpful

Good quality amp

David from Ridgecrest, CA on 7/1/2018

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Amp worked very well. Sounded good. Nice small size which made it easy to put under the seat.

Pros: small foot print, easy to install, worked good

Cons: none

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8 of 8 found this helpful

Pioneer GM-A4704

Crutchfield customer from Norwalk, CA on 6/9/2018

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I was looking for a better sound on my car, a Honda CRV 2014 with four speakers without a premium sound; mainly interested on a more clear sound, replaced the four speakers with the 43CSC674 and a Pioneer amplifier GM-A4704, the improvement on the sound is awesome, I got a better system then expected.

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6 of 6 found this helpful

Great amp for the price!!

Rob from Indianapolis, IN on 4/15/2018

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This is a very good sounding amp, especially for the cost. Upon hooking it up in my boat, I heard parts in the music that I didn't even know were present! The filters and settings allow it to be used in a wide variety of applications, from powering a sub to powering all 4 full range channels.

Pros: Easy to install with a lot of input options (2 channel, 4 channel, bridged) and an attractive design.

Cons: None!

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6 of 7 found this helpful

Good, powerful amp

Bill from Mesa, AZ on 3/21/2018

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Just installed this and haven't really put it through its' paces just yet but it delivers nice, clear sound and good power. The amp is easy to adjust and very flexible in how it is used. You can use it to power a single bass, not use any built in frequency control or you can decide which channel will be low or high pass and adjust appropriately.

Pros: Easy to install, multi-configuration, good power and sound quality

Cons: Only giving four stars since I haven't used it for very long

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2 of 5 found this helpful

Pioneer GM-A4704

Frank from Nevada City, CA on 10/30/2017

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Easy to install, looks good, sounds good!!!

Pros:

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1 of 2 found this helpful

Pioneer GM-A4704

Malcoln from Stamford, CT on 7/2/2017

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Great amp. An impressive upgrade from my old sound.

Pros:

Cons:

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3 of 4 found this helpful

Great sound and clarity

Steve from Chicago, IL on 6/15/2017

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Even on min power this amp produces clear sound and good power. i have it running a pair of 4x6 infinity reference and a pair of 5.25 in infinity reference to match the 4x6s. this is all in my 2001 Jeep Wrangler with a Pioneer HU. I was not sure what to expect, as this is the first time I have installed an aftermarket HU, speakers and amp. The sound quality is so much better than a stock radio, and with this amp, I hear more of the music and at higher volume. Even in a very loud car like a Jeep, this amp provides the sound I need to hear my music in any road conditions, or with the top off and doors left behind. I am very happy with this purchase.

Pros: price, performance, easy to install.

Cons: runs a little hot, and since i dont have a/c i am looking for ways to keep the heat level down

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9 of 12 found this helpful

Pioneer GM-A4704

Crutchfield customer from Plano, TX on 4/18/2017

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Good quality, works as advertised

Pros: easy install

Cons: none

Crutchfield response on

6 of 9 found this helpful

Pioneer GM-A4704

Crutchfield customer from Chesapeake, VA on 2/28/2017

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This is first amplifier I have ever bought. I installed this a long with 8 Pioneer speakers on my school bus, the sound is crystal clear with the HU turned all the way up.

Pros: Easy to install Great sound

Cons: Gets very warm when volume turned all the way up

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6 of 7 found this helpful

Great upgrade to two OEM amps !

George from Denver, CO on 1/23/2017

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Purchased this Pioneer amp to replace two smaller OEM amps (one for front door 6.75" speakers) and the other inside the console for rear 6.75" door speakers in a Toyota Sequoia with OEM upgrade JBL stereo. Much cleaner sound and more bass punch as well - recommended upgrade for this vehicle with JBL OEM factory stereo.

Pros: Price + Pioneer quality

Cons: None so far

Crutchfield response on

11 of 13 found this helpful

Affordable Quality

Doug from Snohomish, WA on 1/12/2017

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This inexpensive amp does a great job. My car audio just needed more punch than the factory head unit could provide, and the 4704 accomplished more than I expected. If you want to shake the earth this is not the unit for you. But if you're trying for better overall sound and considerably more volume without distortion this is the one. Pete was very pleasant and knowledgeable. I am a Crutchfield believer!

Pros: Quality Price Included features

Cons: Not one

Crutchfield response on

13 of 14 found this helpful

Pioneer GM-A4704

Vern from Ohio on 1/2/2017

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Didn't care for it much, would not recommend it. Sorry.

Pros: None

Cons: Couldn't get it to really drive the speakers the way I thought it would.

Crutchfield response on 1/4/2017
Vern, we're sorry you're disappointed with your new amp. Whenever you are not completely satisfied with anything you purchase from Crutchfield, please contact our Customer Support team. Purchases from Crutchfield can be returned or exchanged within 60 days of the purchase.

15 of 45 found this helpful

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Product Research

Features

CEA-2006 Compliant: CEA-2006 is a system of testing and measurement methods for mobile audio amplifiers. This voluntary standard advocates a uniform method for measuring 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), and over a frequency range of 20 Hz to 20 kHz (for full range amplifiers). Signal-to-Noise ratio is measured in weighted absolute decibels (dBA) at a reference of 1 watt into 4Ω. CEA-2006 standards allow consumers to compare amplifiers on an equal basis. Using CEA-2006 criteria, the Pioneer GM-A4704 is rated at 40 watts RMS x 4 channels, with a 78 dBA signal to noise ratio.

Specifications: The manual also lists these non CEA-2006 compliant specifications:

  • Power:
    • 2Ω: 65 watts x 4 channels (14.4 volts, 1 kHz, no more than 1% THD+N)
    • Bridged: 130 watts x 2 channels (into 4Ω, 14.4 volts, 1 kHz, no more than 1% THD+N)
  • Signal to Noise Ratio: 94 dB (at rated power)

Gain Control: To accommodate the varying range of signal levels coming from today's factory and aftermarket radios, the input gain is adjustable (0.3V-6.5V line level, 3V-26V speaker level). The front (Channel A) and rear (Channel B) inputs have separate gain controls.

LPF/HPF: The amplifier has independent crossovers for the front (Channel A) and rear (Channel B) outputs. Each crossover can be set to LPF (Low-Pass Filter), HPF (High-Pass Filter), or Off (All-Pass). The crossover point for the high-pass filter on Channel A is variable between 40Hz and 500Hz, adjustable via a rotary control. The crossover point for high-pass filter on Channel B and both low-pass filters is fixed at 80Hz. The slope for all crossovers is 12dB/octave.

Power Connections: The power and ground connections are 0.54" wide screw terminals, the remote turn-on screw terminal is 0.325" wide. A Phillips-head or flat blade screw driver (not included) is required to tighten/loosen the terminals. With a total fuse rating of 30 amps, 10 AWG power and ground wire is recommended. A 30A fuse should be placed on the power wire within 18" of the battery. Spade connectors are recommended for the power, ground, and remote wires.

Speaker Connections: The speaker screw terminals are 0.325" wide. A Phillips-head or flat blade screw driver (not included) is required to tighten/loosen the terminals. Spade connectors are recommended for the speaker wires.

RCA Input: The amplifier features two pairs of stereo RCA line level inputs (Channel A left/right and Channel B left/right). The Input Select switch lets you set the amplifier for 2-Channel or 4-Channel Input. If set to 2-Channel, the input signal from Channel A left/right will be sent to all four channels.

Speaker Input: The included speaker level input harness allows you to connect your OEM radio (or aftermarket radio that does not have the typical RCA-type outputs) without having to buy an adapter. When the speaker input harness is used, the amplifier is set to 4-Channel mode automatically.

Auto Power On: When using the speaker level input, a circuit senses the input signal and turns the amp on automatically. This feature makes it easier to add an amplifier to a factory radio or to a receiver with no preamp outputs.

Fuse: The amp is protected by one 30-amp ATO blade fuse.

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Customer Q&A

Q
Crutchfield asked: Why did you buy this?
A
I was looking for a amplifier that would give me a rich full sound at low volume. I enjoy rich full bass, and clean clear highs. I purchased a beautiful high end Pioneer Stereo, so it felt logical to also purchase an amplifier to compliment it. [ D  Jul 29, 2019 ]
A
seems to be a good fit for the speakers I chose [ jeff  Jun 05, 2019 ]
A
Simple and clean, just what i need [ Richard  Jan 23, 2019 ]
A
price and quality [ rennie  Dec 09, 2018 ]
A
Name brand [ Paolo  Nov 23, 2018 ]
A
Recommended to me by Ryan. [ Haackdogg  Nov 09, 2018 ]
A
The reputation [ Napoleon  Apr 25, 2018 ]
A
Was looking for an inexpensive upgrade to my pontoon boat's stereo. [ Robert  Mar 24, 2018 ]
A
Adviser recommendation [ Barry  Feb 20, 2018 ]
A
Needed an amp to push my new aftermarket speakers. [ Rob  Jan 29, 2018 ]
A
looks like the bang for the buck [ KATHRYN  Jan 12, 2018 ]
A
Wattage and price is a good choice for recently ordered speakers and CD head unit from crutchfield [ David J.  Dec 31, 2017 ]
A
I was in the market for a 4 channel amp and this one was recommended by Ryan from Crutchfield [ Kip  Dec 05, 2017 ]
A
It looks like it will work well to power the JVC speakers purchased [ Wesley  Nov 06, 2017 ]
A
Right power output for my application. I've used Pioneer amps before and have never had any complaints. [ David  Nov 04, 2017 ]
A
Compact and lots of power [ Peter  Aug 12, 2017 ]
A
i have the same amp in my car and it has been working really good, so i decided buy the same amp for my wife's car [ CESAR  Aug 04, 2017 ]
A
My old Kenwood amp died :(. The Pioneer also has the same connectors and my car is already wired for an amp [ David  Jun 11, 2017 ]
A
I left the decision to the experts, and as usual, my advisor selected the right component for my situation. Thanks again Crutchfield. [ George  Jun 11, 2017 ]
A
best rating [ Carrie  May 24, 2017 ]
A
I was looking for something to enhance the stereo in my truck. [ PHILL  May 08, 2017 ]
A
fits needs for customers car [ Michael  May 02, 2017 ]
A
this amp. was what your rep. said would work best with my radio and speakers. [ Gerald  Apr 11, 2017 ]
A
function and price [ Michael  Mar 17, 2017 ]
A
Crutchfield's recommendation for application, price was in budget, delivery time was perfect for my available installation time. [ Kevin  Mar 06, 2017 ]
A
Right amount of power, Pioneer name + good price .................. [ GEORGE H  Dec 28, 2016 ]
A
Stereo receivers do not produce enough power to obtain the maximum performance from the speakers and therefore I purchased this model amplifier to match with the stereo/speaker setup I selected. [ William  Nov 28, 2016 ]
SHOW MORESHOW LESS

1 question already asked

Q
Does this amp have the feedback silencer built in to prevent alternator feedback?
[ Robby  Aug 28, 2018 ]
3 answers
A
I'm not sure if it does, but there is no feed back in the vehicle that it is installed in. I installed it into a 2003 Saturn Vue a little over a year ago.
[ Brian  Sep 03, 2018 ]
A
I don't know for sure, but I get NO alternator feedback with it.
[ Greta  Sep 03, 2018 ]
A
I really dont know. Sorry Robert
[ ROBERT  Aug 31, 2018 ]

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