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Class FD 4-Channel Bridgeable Amplifier

• 1,200 Watts Max Power

• Compact Design for Versatile Installation Options

• Refined Class FD Design Offers Extreme Efficiency and High-Quality Sound

An amplifier shouldn’t take up too much space, especially in your car. The GM-D8704 might just be what you’re looking for. It combines a 1-Ohm stable circuit, installation flexibility and a superior high-power output.


Pioneer’s new extra-efficient Class-D digital amplifiers mark a dramatic improvement in power output capability, yet are 50% smaller than the current GM-Series Class-AB amplifiers. That makes them more versatile in terms of installation as well as performance.


To prevent circuit shutdown, Pioneer’s new digital amplifier circuit “Protection Control System” senses its internal temperature and automatically moderates input level accordingly. Stable, durable circuitry lessens the risk of high input power for the unit to achieve 1 Ω connection. This design enhances the flexibility to connect multiple subwoofers to a system.


For extra flexibility, variable LPF and HPF make audio frequency more adjustable according to subwoofer characteristics and personal listening preferences. The GM-D8704 LPF and HPF are adjustable from 40 Hz to 500 Hz.


What, you DON’T own a Pioneer head unit? Well, we won’t hold it against you. In fact we’ll even help you build onto your system. The GM-D8704’s speaker level inputs allow you to connect your OEM unit (or any unit that doesn’t have the typical RCA-type inputs) without having to buy add-on adapters. So, the install goes faster, you save money, and you’ve got a Pioneer amp in your vehicle.

Number of channels 4

Max. Wattage (4Ω)

Max. Wattage (2Ω)

Max. Wattage Bridged (4Ω)

Frequency Response 10 Hz - 50 kHz

Wattage RMS (4Ω <=1% THD+N) 4 x 100w

Wattage RMS (2Ω <=1% THD+N) 4 x 150w

Wattage RMS Bridged(4Ω) 2 x 300w

Total Harmonic Distortion (1 kHz, 4Ω) <0.05%

Signal-to-Noise ration (IHF-A Weighted) >95dB

RCA Outputs (Pass-Through) 2 Ch

Speaker Level Input 4 Ch

Automatic Signal Sensing & Turn On Yes

Crossover Type Variable HPF / Variable LPF

Crossover Frequency 40Hz to 500 Hz

Dimensions 252 x 215 x 60 (mm)

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