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Pioneer GM-A4604

4-channel car amplifier — 40 watts RMS x 4

Item # 130GMA4604

Many people never think to upgrade their car's audio system, suffering with subpar sound when they listen to music.

Many people never think to upgrade their car's audio system, suffering with subpar sound when they listen to music.

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Discontinued item
10 questions - 12 answers

Item # 130GMA4604

About the Pioneer GM-A4604

Plays loud and clear

Many people never think to upgrade their car's audio system, suffering with subpar sound when they listen to music. Pioneer's GM-A4604 4-channel amplifier will greatly improve the sound quality in your vehicle, so you'll look forward to spending time on the road. This punchy Pioneer amp will power your front and rear speakers with 40 watts RMS each, which is a huge jump over the power supplied by your car radio. You'll hear more of the little details in your music, even when you turn your system up to compete with the road noise.

Plays loud and clear

Many people never think to upgrade their car's audio system, suffering with subpar sound when they listen to music. Pioneer's GM-A4604 4-channel amplifier will greatly improve the sound quality in your vehicle, so you'll look forward to spending time on the road. This punchy Pioneer amp will power your front and rear speakers with 40 watts RMS each, which is a huge jump over the power supplied by your car radio. You'll hear more of the little details in your music, even when you turn your system up to compete with the road noise.

Practical features

You can also put this versatile amp into 2-channel mode to send up to 120 watts RMS each to a couple of component speakers or subwoofers. Switchable 80 Hz high- and low-pass filters on the A channels help take the rumble away from full-range speakers or the sizzle away from a sub. The B channels sport variable high-and low-pass filters so you can better adjust the sound for critical front soundstaging or a finely-tuned bass. Speaker-level inputs allow you to add the GM-A4604 to a factory radio. This amp's performance features and reasonable price make it a great choice for almost any vehicle needing a sonic upgrade.

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Product highlights:

  • 4-channel car amplifier
  • 40 watts RMS x 4 at 4 ohms (60 watts RMS x 4 at 2 ohms)
  • 120 watts RMS x 2 in bridged mode (4-ohm stable in bridged mode)
  • CEA-2006 compliant
  • switchable high- and low-pass filters (80 Hz, 12 dB/octave) on A channels
  • variable high- and low-pass filters (40-500 Hz, 12 dB per octave) on B channels
  • Class AB amp technology, MOSFET power supply
  • preamp and speaker-level inputs
  • fuse rating: 30A x 1
  • 8-gauge power and ground leads recommended — wiring and hardware not included with amplifier
  • 13"W x 2-3/8"H x 8-1/2"D
  • warranty: 1 year
  • Our 60-day money-back guarantee
  • MFR # GM-A4604

What's in the box:

  • 4-Channel amplifier
  • 30amp ATO fuse (installed)
  • 4" Speaker-level input harness
  • Four 5/8" Self-tapping screws
  • Owner's Manual (English/ French/ Spanish)
  • Warranty information

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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-A4604 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: 60 watts x 4 channels (14.4 volts, 1 kHz, no more than 1% THD+N)
    • Bridged: 120 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: The A and B halves of the four channel amp have independent gain controls. To accommodate the varying range of signal levels coming from today's factory and aftermarket radios, the input gains are adjustable (300mV-6.5V line level, 3V-26V speaker level).

Gain Control Caution: If the gain control level is set too high, Pioneer's Gain Control Caution feature will automatically reduce the amplifier's output until the headunit volume is decreased to acceptable levels. This added layer of protection helps prevent damage to the amplifier and the connected speakers due to improper gain control adjustments.

Crossovers: The A and B sections of the amplifier also have independent crossover circuits:

  • A: The A channels' crossover point is fixed at 80 Hz and the slope is 12 dB/octave. A three position switch specifies the crossover operation: LPF (low-pass), Off (crossover bypassed), or HPF (high-pass).
  • B: The B channels' crossover point is continuously variable from 40 to 500 Hz and the slope is 12 dB/octave. A three position switch specifies the crossover operation: LPF (low-pass), Off (crossover bypassed), or HPF (high-pass).

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. 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 pair of stereo RCA line level inputs, left/right A and left/right B.

Speaker Input: The included four channel 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.

Input Select: When using only one pair of RCA inputs, set the Input Select switch to 2CH to send the one pair of inputs to both the A and B sections of the amp.

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 a single 30-amp ATO blade fuse.

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Customer Q&A

Q
Crutchfield asked: Why did you buy this?
A
to power subwoofers [ Honarai  Aug 31, 2016 ]
A
Good performance, good price, fairly small package. I couldn't turn it down. [ Scott  Apr 22, 2016 ]
A
Highly rated, adjustable inputs/outputs, good price [ R  Feb 17, 2016 ]

10 questions already asked

Q
what wiring will i need for this amp? I have an after-market pioneer stereo and 4 after-market pioneer speakers.
[ chris  Sep 13, 2016 ]
1 answer
A
You will need speaker wire to run from the amp to the new speakers, you will need power cables to run back to the battery (minimum 10 gauge, preferably a fused wire), you will need an amp power control cable to run to the amp from the radio (when the radio turns on this wire turns the amp on, can be small gauge), you will then need either RCA cables to run out of the line out on the radio if equipped (recommended) or more speaker wire to run from the speaker out of the radio to the speaker level input on the amp.
[ edward  Sep 14, 2016 ]
Q
Would this have enough power to push 4 100 rms kicker door speakers. Or should I go with more wattage. ?
[ Bonefinger  Sep 11, 2016 ]
2 answers
A
Joseph has the right answer for you Ryan. While you can use this amp to power the Kicker speakers, you'd want to upgrade to the GM-D8604 in order to power them to their full potential: http://www.crutchfield.com/p_130GMD8604/item.html I hope that helps! My Bio: http://www.crutchfield.com/Support/Bio.aspx?bio=5
[ Ryan  Sep 17, 2016 ]  Staff
A
If you are looking push 4 100 rms speakers you need a 4 channel with 100 watts a channel.
[ JOSEPH  Sep 16, 2016 ]
Q
Can this amp provide a 2 ohm load to the front of the car (the dash and front door speakers in the 2016 Camry are 4 ohm each, wired parallel), while simultaneously powering 4 ohm speakers in the rear?
[ Andrew  Apr 16, 2016 ]
1 answer
A
Yes, you would be able to drive a pair of 2-ohm speakers and a pair of 4-ohm speakers simultaneously with the Pioneer GM-A4604 amplifier. I hope that helps. My Bio: http://www.crutchfield.com/Support/Bio.aspx?bio=159
[ Larry  Apr 19, 2016 ]  Staff
Q
If we want to bridge the amp, must the channel selector on the front panel, be on 2 and the cross wiring done as shown on the back linking channel A and B as shown? I just don't want to blow something up. Thanks.
[ Trevor  Mar 19, 2016 ]
1 answer
A
I ordered a new Pioneer car stereo and amp for my truck. Once it all arrived, I determined that the amp was unnecessary and returned it.
[ WILLIAM J  Mar 20, 2016 ]
Q
What are the dimensions of this product?
[ Big G  Feb 25, 2016 ]
1 answer
A
The manufacturer lists dimensions as W=13", H=2.375", D=8.5". Hope that helps.
[ Kenny  Feb 25, 2016 ]  Staff
Q
can I use this amp with 3 ohm speakers?
[ Glen  Feb 24, 2016 ]
1 answer
A
Yes. The amp is stable down to 2 Ohms on each channel so you can certainly use 3 Ohm speakers if need be. I hope that helps! My Bio: http://www.crutchfield.com/Support/Bio.aspx?bio=5
[ Ryan  Feb 27, 2016 ]  Staff
Q
I have a 5 door van. Is this amp has enoughpower to run 2 component speakers 50w each (nominal) for front and 2 coaxial speakers 50w (nominal) for rear? Joining them with 8in powered subwoofer.
[ Andre  Jul 20, 2015 ]
2 answers
A
yes it definitely is. With this amp I never have to turn my head unit past 14 out of 35. and thats with all 4 windows down
[ AUSTIN T  Jul 20, 2015 ]
A
Thanks for your question. For information on selecting the best amp for your subs and speakers, 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  Jul 20, 2015 ]  Staff
Q
Can this amp be set up as a 3 channel amp? Example, using one pair of unbridged channels to run two full range speakers, while bridging the other two channels into one channel to drive a subwoofer
[ Hiram  Dec 13, 2013 ]
1 answer
A
Thanks for your question Hiram. You'll be happy to know that you can certainly run the amp this way. It is a great solution for many systems.
[ Jeff  Dec 16, 2013 ]  Staff
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