Powerful 4-Channel Class AB Amplifier With 1000W Maximum Power & Variable Bass Boost!

Bridgeable Design with Variable HPF/LPF & Adjustable Bass Boost 0-12dB

The Pioneer GM-A6704 delivers high-performance audio amplification with professional-grade features. This 4-channel Class AB amplifier produces 60W RMS x 4 at 4Ω or can be bridged to deliver 190W RMS x 2 at 4Ω for component speakers or subwoofer applications. The versatile design allows operation in 4-channel, 3-channel, or 2-channel modes, making it perfect for powering complete systems from front and rear speakers to dedicated subwoofer configurations.

The automatic signal sensing technology automatically selects between RCA or speaker-level inputs and powers on in sync with your receiver. Variable high-pass filter (40Hz-500Hz) and low-pass filter provide precise frequency control on both channel sets. The adjustable bass boost feature offers 0/6/12dB of enhancement at 50Hz for optimal low-frequency impact. With high-volt input level control accommodating up to 6.5V (RCA) or 26V (speaker level), large toroidal transformer for stable power supply, and comprehensive protection circuitry, the GM-A6704 delivers clean, powerful, distortion-free performance.

✔ Key Features & Benefits

✔ Class AB Design: Balanced efficiency and performance with minimized crossover distortion for high-quality sound reproduction
✔ Variable Bass Boost: Adjustable bass enhancement from 0 to 12dB at 50Hz in three levels (0/6/12dB) for customized low-frequency impact
✔ Variable HPF/LPF: Adjustable high-pass and low-pass filters from 40Hz to 500Hz for precise frequency control and system optimization
✔ Multiple Configuration Modes: Operate in 4-channel, 3-channel, or 2-channel modes for flexible system building
✔ Bridgeable Configuration: Combine channels for 190W RMS x 2 at 4Ω for component speakers or subwoofer applications
✔ Automatic Signal Sensing: Automatically detects RCA or speaker-level inputs and powers on with receiver
✔ Large Toroidal Transformer: High-quality power supply with high-speed switching MOSFET for stable, consistent performance
✔ Comprehensive Protection: Thermal, short circuit, and overload protection with gain control caution feature

Technical Specifications

Class: Class AB Amplifier
Channels: 4-Channel (Bridgeable to 2-Channel)
Maximum Power: 1000W Total (170W x 4 at 4Ω, 250W x 4 at 2Ω)
RMS Power (CEA-2006): 60W x 4 at 4Ω (14.4V)
RMS Power: 95W x 4 at 2Ω
Bridged Power: 190W x 2 at 4Ω
Continuous Power: 60W x 4 (50Hz-15kHz, 5% THD, all channels driven)
Load Impedance: 2Ω to 8Ω (2Ω minimum for bridged mode: 4Ω)
Frequency Response: 10Hz - 70kHz (+0dB, -3dB)
Signal-to-Noise Ratio: 95dB (IEC-A Network)
Distortion: 0.05% (10W, 1kHz)
Input Sensitivity: 0.3V - 6.5V (RCA), 3.0V - 26V (Speaker Level)
Variable HPF/LPF: 40Hz-500Hz, 12dB/Octave Slope
Fixed LPF: 80Hz, 12dB/Octave Slope
Bass Boost: 0/6/12dB at 50Hz
Inputs: 4 x RCA, Speaker-Level with Auto-Sensing
Outputs: Screw-Type Speaker Terminals
Fuse: 25A x 2
Power Supply: 14.4V DC (10.8V - 15.1V allowable)
Current Consumption: 31A Maximum