Versatile 4-Channel Class AB Amplifier With 520W Maximum Power & Variable High-Pass Filter!

Bridgeable Design with Automatic Signal Sensing & Multiple Configuration Options

The Pioneer GM-A4704 delivers flexible and powerful audio amplification for comprehensive system configurations. This 4-channel Class AB amplifier produces 40W RMS x 4 at 4Ω or can be bridged to deliver 130W 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, perfect for powering front and rear speakers or combining channels for subwoofer use.

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) on channels A provides precise frequency control, while channels B feature selectable 80Hz high-pass or low-pass filters. The high-volt input level control accommodates gain adjustment from 0.3V to 6.5V (RCA) or 3.0V to 26V (speaker level). With compact dimensions and efficient heat dissipation through the one-body heat sink design, the GM-A4704 offers professional-grade performance for building complete car audio systems.

✔ Key Features & Benefits

✔ Class AB Design: Balanced efficiency and performance with minimized crossover distortion for high-quality sound reproduction
✔ Multiple Configuration Modes: Operate in 4-channel, 3-channel, or 2-channel modes for flexible system building
✔ Variable High-Pass Filter: Adjustable frequency control from 40Hz to 500Hz on channels A for precise audio tuning
✔ Bridgeable Configuration: Combine channels for 130W 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
✔ Compact Space-Efficient Design: Small footprint with one-body heat sink for flexible installation
✔ Speaker-Level Inputs: Compatible with factory radios without RCA outputs using included high-level input harness
✔ Protection Circuit: Built-in protection system guards against overheating, short circuits, and DC offset

Technical Specifications

Class: Class AB Amplifier
Channels: 4-Channel (Bridgeable to 2-Channel)
Maximum Power: 520W Total (80W x 4 at 4Ω, 130W x 4 at 2Ω)
RMS Power (CEA-2006): 40W x 4 at 4Ω (14.4V)
RMS Power: 65W x 4 at 2Ω
Bridged Power: 130W x 2 at 4Ω
Continuous Power: 40W 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: 94dB (IEC-A Network)
Distortion: 0.05% (10W, 1kHz)
Input Sensitivity: 0.3V - 6.5V (RCA), 3.0V - 26V (Speaker Level)
High-Pass Filter (Channels A): Variable 40Hz-500Hz, 12dB/Octave Slope
Filters (Channels B): Fixed 80Hz HPF/LPF, 12dB/Octave Slope
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)