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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...

Read more from Crutchfield writer, Buck P.

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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
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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

Customer reviews

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Pioneer GM-A4704 Reviews

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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
Simple and clean, just what i need [ Richard  Jan 23, 2019 ]
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price and quality [ rennie  Dec 09, 2018 ]
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Name brand [ Paolo  Nov 23, 2018 ]
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Recommended to me by Ryan. [ Haackdogg  Nov 09, 2018 ]
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The reputation [ Napoleon  Apr 25, 2018 ]
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Was looking for an inexpensive upgrade to my pontoon boat's stereo. [ Robert  Mar 24, 2018 ]
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Adviser recommendation [ Barry  Feb 20, 2018 ]
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Needed an amp to push my new aftermarket speakers. [ Roberto  Jan 29, 2018 ]
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looks like the bang for the buck [ KATHRYN  Jan 12, 2018 ]
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Wattage and price is a good choice for recently ordered speakers and CD head unit from crutchfield [ David J.  Dec 31, 2017 ]
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I was in the market for a 4 channel amp and this one was recommended by Ryan from Crutchfield [ Kip  Dec 05, 2017 ]
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It looks like it will work well to power the JVC speakers purchased [ Wesley  Nov 06, 2017 ]
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Right power output for my application. I've used Pioneer amps before and have never had any complaints. [ David  Nov 04, 2017 ]
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Compact and lots of power [ Peter  Aug 12, 2017 ]
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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 ]
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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 ]
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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 ]
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best rating [ Carrie  May 24, 2017 ]
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I was looking for something to enhance the stereo in my truck. [ PHILL  May 08, 2017 ]
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fits needs for customers car [ Michael  May 02, 2017 ]
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this amp. was what your rep. said would work best with my radio and speakers. [ Gerald  Apr 11, 2017 ]
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function and price [ Michael  Mar 17, 2017 ]
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Crutchfield's recommendation for application, price was in budget, delivery time was perfect for my available installation time. [ Kevin  Mar 06, 2017 ]
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Right amount of power, Pioneer name + good price .................. [ GEORGE H  Dec 28, 2016 ]
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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 ]
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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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