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Pioneer GM-A4604

4-channel car amplifier — 40 watts RMS x 4

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  • Pioneer GM-A4604

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  • Pioneer GM-A4604

  • Pioneer GM-A4604

  • Pioneer GM-A4604

  • Pioneer GM-A4604

  • Pioneer GM-A4604

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Our take on the Pioneer GM-A4604

by Buck Pomerantz
Pioneer

My system has plenty of power. Who needs an amp?

You might think you don't need an amp because you have a 400-watt system in your car, or because your new stereo puts out 50 watts a channel. But those are peak wattage ratings, which may boil down to 15 or 20 watts per channel, using the more realistic RMS rating. An amp sends your speakers the power they need to deliver your music with clarity and impact, whether you're using factory speakers or high-performance components. And low-frequency reproduction requires lots of power, so an amp is an absolute must if you're adding a sub to your system.

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.

Read more

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.

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

Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and Specs
Performance
RMS Power Output (Watts x Channels) 40 x 4
Peak Power Output (Watts x Channels) 120 x 4
Power at 2 Ohms (Watts x Channels) 60 x 4
Bridged Power (Watts x Channels) 120 x 2
Minimum Impedance Bridged 4
Minimum Impedance Unbridged 2
Best Frequency Response 10-70K Hz
THD at Rated RMS Power 1%
Signal to Noise Ratio 78 dB
Input Voltage 14.4v
Features
Amplifier Class AB
Low-Pass Crossover Frequency 40-500 Hz
Low-Pass Slope (dB/octave) 12 dB/octave
High-Pass Crossover Frequency 40-500 Hz
High-Pass Slope (dB/octave) 12 dB/octave
Bass Boost No
Bass Boost Frequency N/A
Fan Cooled No
Fuse Rating 30
Speaker Level Inputs Harness
Preamp Outputs No
Width (inches) 13
Height (inches) 2-3/8
Depth (inches) 8-1/2
Parts Warranty 1 Year
Labor Warranty 1 Year
Product Research
What's in the box?

Download owner's manual

  • 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

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team — they open the box, verify contents, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

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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Pioneer GM-A4604 Reviews

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Filter by rating:
5 out of 5

Great Amp

Written By Pioneer 4604, PA Philadelphia on Monday, September 01, 2014
Crutchfield Customer Review (What's this?)
 
Great sounding Amp well worth the money sounds great clear sound
Pros:
Good brand
Cons:
None
Was this review helpful?    Yes | No
 
5 out of 5

Amplifier Review

Written By Ron, Chestertown, MD on Saturday, March 29, 2014
Crutchfield Customer Review (What's this?)
 
Got this amp to power 4 replacement 5X8 speakers. Great stock upgrade.
Pros:
Powers multiple channels
Was this review helpful?    Yes | No
 
5 out of 5

Pioneer GM-A4604

Written By Anonymous, M'boro on Monday, January 13, 2014
Crutchfield Customer Review (What's this?)
 
Wonderful amp to run full range speaker,...
Pros:
Great sound for the price
Was this review helpful?    Yes | No
 

1 question already asked

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
  • 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 Staff  Dec 16, 2013 ]

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