Pioneer GM-A6704 1000W Max Class AB Bridgeable 4-Channel Car Amplifier
- 1000 watts max, 4 channels, bridgeable
- 60 watts RMS to each front and rear channel
- Variable high and low pass filters
- Auto signal sensing and turn-on
- 12 volt, 5 A supply current
- 4.9 pounds, 1 year warranty
Last refreshed Oct 2, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A four channel Class AB amplifier that powers front and rear speakers and can be bridged for more output. The maximum figure is a peak, so plan around the per channel RMS rating.
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ASIN: B01KKHT2MYModel: GM-A6704Category: Amplifiers
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Overview
A Class AB output stage handles amplification in this four channel car amplifier, balancing efficiency against clean sound. Variable high and low pass filters shape the signal, and automatic sensing switches it on with the receiver.
It gives a clear jump in power over a stock radio and ties its turn on to the head unit, which simplifies wiring. The headline wattage is a maximum, and the listing gives no frequency response or signal to noise figures to confirm sound quality.
Who it's for
Drivers upgrading four speakers from head unit power to a dedicated amplifier. Anyone building a subwoofer system around one channel, or wanting a stated damping or noise figure, should compare other amplifiers.
Pros and cons
- Four channels, bridgeable
- Variable high and low pass filters
- Automatic signal sensing
- Turns on with the receiver
- Maximum power is a peak figure
- Noise and response figures missing
- Plastic material listed
Performance notes
The Class AB design runs the output transistors in a way that favors low crossover distortion over efficiency, so it draws a steady current and gives off some heat. The filters let the channels be set for full range or for bass duty, and bridging combines two channels for more power into one speaker.
Specifications
| Brand | PIONEER |
|---|---|
| Model | GM-A6704 |
| Dimensions & fit | |
| Item dimensions | 8.5 x 14 x 2.38 inches |
| Item weight | 4.9 pounds |
| Capacity & performance | |
| Maximum output power | 1000 watts |
| Power & efficiency | |
| RMS power per channel | 60 watts each |
| Voltage | 12 volts DC |
| Construction & materials | |
| Material type | Plastic |
| Compatibility & installation | |
| Mounting type | Surface Mount |
| Warranty & support | |
| Warranty description | 1 year |
| Other details | |
| Number of channels | 4 |
| Supply current | 5 A |
| Highlight | High-/low-pass filters |
Frequently asked questions
How big is the Pioneer GM-A6704 amplifier?
The listing gives 8.5 x 14 x 2.38 inches and a weight of 4.9 pounds, so it is long and flat for an under seat or trunk install.
Does the amplifier turn on by itself?
Yes. The description says automatic signal sensing and turn-on, so it switches on when the receiver is on.
Is it a subwoofer amplifier?
No. It is a four channel full range amplifier for front and rear speakers, with filters that can be set for bass duty.