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Pioneer GM-A6704

4-channel car amplifier — 60 watts RMS x 4

Item # 130GMA6704

Why put an amplifier in your car? Pioneer's GM-A6704 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-A6704

Plays loud and clear

Why put an amplifier in your car? Pioneer's GM-A6704 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 60 watts RMS each, which is 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-A6704 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 60 watts RMS each, which is 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 190 watts RMS each to a couple of component speakers or subwoofers.

Practical features

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. A bass boost adds extra kick, if you want it. Speaker-level inputs allow you to add the GM-A6704 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
  • 60 watts RMS x 4 at 4 ohms (95 watts RMS x 4 at 2 ohms)
  • 190 watts RMS x 2 in bridged mode (4-ohm stable in bridged mode)
  • CEA-2006 compliant
  • variable high-pass (40-500 Hz, 12 dB/octave) and switched 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
  • switchable bass boost (0, 6, 12 dB at 50 Hz) on B channels
  • preamp and speaker-level inputs
  • fuse rating: 25A x 2
  • 8-gauge power and ground leads recommended — wiring and hardware not included with amplifier
  • 14-1/4"W x 2-3/8"H x 8-1/2"D
  • warranty: 1 year
  • Our 60-day money-back guarantee
  • MFR # GM-A6704
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What's in the box:

  • 4-Channel amplifier
  • Two 25A ATO fuses (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-A6704 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-A6704 is rated at 60 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: 95 watts x 4 channels (14.4 volts, 1 kHz, no more than 1% THD+N)
    • Bridged: 190 watts x 2 channels (into 4Ω, 14.4 volts, 1 kHz, no more than 1% THD+N)
  • Signal to Noise Ratio: 95 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.

Bass Boost: The GM-A6704 has a selectable bass boost at 50 Hz for the rear channels (Channel B) only. You can set the boost at 0dB, +6dB, or +12dB.

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 50 amps, 8 AWG power and ground wire is recommended. A 50A 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 two 25-amp ATO blade fuses.

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Customer Q&A

Q
Crutchfield asked: Why did you buy this?
A
Brand Price [ LEE  Jan 29, 2019 ]
A
My car is red...amp fits the need and its red [ Drew  Jan 19, 2019 ]
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Price, power, and brand name [ Michael  Jan 14, 2019 ]
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recommended by friend [ albert  Jan 11, 2019 ]
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Always happy with Pioneer products [ mark  Dec 29, 2018 ]
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Recommended [ Kevin  Nov 27, 2018 ]
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It was recommend by an expert at Crutchfield. Compliments to "Trisha" on the chat room. Gave me what I needed based on what I current have. Everything I have is from Crutchfield so it made things super easy by looking at my purchase history. [ Denmarcus  Aug 07, 2018 ]
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I have the Pioneer 4200 nex radio [ patricia  Jun 28, 2018 ]
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Grandson requested it for his birthday. [ Gail  Jun 23, 2018 ]
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Highest rated, best priced 60 watt by 4 ohm available [ Tony  Jun 16, 2018 ]
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why not [ thomas  Mar 04, 2018 ]
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More power, better sound [ JEFF  Feb 18, 2018 ]
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For compatibility with my head unit and I've been very happy with previous Pioneer purchases [ David  Feb 06, 2018 ]
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Great amp for the price. Older son has same amp and he is very happy with it. [ HUSTON  Jan 12, 2018 ]
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chat with customer service rep [ Kevin S.  Oct 11, 2017 ]
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Need the power [ James  Sep 27, 2017 ]
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Exactly what i needed to upgrade, the interface to configure the gain and highs and lows of frequency and what not is simple to understand, and its not ugly looking. [ Ross  Aug 21, 2017 ]
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Solid brand solid price [ Tsimafei  Jul 22, 2017 ]
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Right amp for what I needed [ Bryan  Jul 17, 2017 ]
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Good price for a 4 Chanel amp [ G  Jul 10, 2017 ]
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Advisor [ AFEEZ  Mar 14, 2017 ]
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Perfect match for my 4 coaxials [ M  Feb 18, 2017 ]
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It was recommended by one of your techs [ Mario  Feb 08, 2017 ]
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I'm going to be using this in a tri-amped system in the mid-bass/mids and highs. I wanted a class-AB amplifier for this range of frequencies not really knowing what is out there in the car stereo amplifier market. I do know, that the best performing Class-AB designs compared to Class-D designs measure much better (On a distortion analyzer) and are less fatiguing to listen too that even the best Class-D amps. [ Cameron  Jan 16, 2017 ]
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My current Alpine just failed, and I weighed the Pioneer that I choose against the Kenwood, which is what I preferred. The Pioneer seemed to offer more for the price. Better wattage, etc. [ Thomas  Oct 20, 2016 ]
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4 questions already asked

Q
When hooking up to a factory radio will I still have full control, like balance and fader?
[ Edward  Aug 06, 2018 ]
1 answer
A
You will want to contact an Advisor by phone (1-800-324-9695) or online chat to discuss compatibility with your factory system. They will be able to pull up your vehicle and see if this will integrate. If it does not, then they will also be able to discuss other options with you.
[ Krissy  Aug 10, 2018 ]  Staff
Q
I have 4 pioneer 6x9 5 ways along with pioneer ts-w311d4 subwoofer and amp gm-a6704. completely confused about wiring choices. can you help? I have searched the net extensively with no luck finding a wiring diagram.
[ Kevin  Nov 02, 2017 ]
2 answers
A
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 and see if there may be a fix. 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, or try our online support center: http://crutchfield.custhelp.com/app/answers/list/kw/.
[ Krissy  Nov 07, 2017 ]  Staff
A
Crutchfield customer service /advisors are who you want to talk to.
[ dmart  Nov 03, 2017 ]
Q
Is this enough to power speakers and subwoofers? (kicker cvr)
[ charlie  Aug 18, 2017 ]
3 answers
A
The amp is made for the speakers in your door you could power a subwoofer as long as the sub rms watts is 100 or lower so you can make sound out of the subwoofer but really you should get a separate amp that is bridgeable and made specifically for a subwoofer it will sound a million times better if you buy the pioneer it is nice for the price I had to send mine back due to overheating issues but other than that it has been great. If you do end up buying the amp make sure your speakers that you hook up too it are nothing lower than 60 watts rms just to keep from overpowering the speakers and blowing them because the amp puts out 60 watts rms.
[ Scott  Aug 26, 2017 ]
A
If you know how to do bridging on 2 channels of an amp, you could use it for 2 speakers and 1 sub woofer (around 45 watts RMS into 8 ohm, higher into 4 ohm). FD
[ Forrest L Dilley  Aug 19, 2017 ]
A
Not knowing how many subs or speakers you want to drive, you will want to use the 4 ohm versions or create a 4 ohm load. It is 195 watts bridged 4 ohms. Not stable in 2 ohm loads. It will depend on the music, desired volume level, and the amount of ambient background noise you have. Your question is limited in information to make a complete answer. It's a bit like asking about the weather and only being told the temperature without mention of clouds, wind, humidity, etc. that make significant differences in how it feels. In your case, 4 speakers and two subs, or 2 and 2, or 4 and 1.....? Do you need fader controls?
[ Steven  Aug 19, 2017 ]

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