Pioneer GM-A4704 GM Series Class AB Amp (4 Channels, 520 Watts max)

Pioneer GM-A4704 4-channel car amplifier 40 watts RMS x 4

• 520 Watts Max Power


• Automatic signal sensing and Turn-ON


• Variable high pass filter


• Speaker level inputs

Technology of the GM Series

From dramatic distinction to dramatic design, Pioneer's new GM-Series amplifiers are thrillers in every sense, pushing the limits of flexibility and functionality.

Variable HPF

Variable HPF (high pass filter) allow for adjustable frequency from 40 Hz to 500 Hz* and greater car audio system flexibility according to subwoofer characteristics and personal listening preference.

Growing Power, Shrinking Size

New Pioneer amps brilliantly integrate high-power performance superior to that of previous models in space-efficient sizes for flexibility of installation in various car cabins.

Automatic Signal Sensing and Turn-On

Pioneer amplifiers automatically select the proper input signal mode, either RCA or speaker level. When the receiver is turned on, the amplifier automatically turns on. When connected to an OEM receiver or a receiver without RCA output and utilizing speaker level output, the amp automatically senses the input mode and powers up in sync with the receiver.

When connected to an OEM receiver or a receiver without RCA output using speaker wire, the amplifier is turned on at the same time as the receiver. Pioneer's amplifiers automatically detect the input signal and select RCA level or speaker level.

• 4-channel car amplifier


• 40 watts RMS x 4 at 4 ohms (65 watts RMS x 4 at 2 ohms)


• 130 watts RMS x 2 in bridged mode (4-ohm stable in bridged mode)


• CEA-2006 compliant


• Class AB amp technology


• variable high-pass (40-500 Hz, 12 dB/octave) and switchable 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


• preamp and speaker-level inputs


• fuse rating: 30A x 1


• 10-gauge power and ground leads recommended wiring and hardware not included with amplifier


• 12-1/16"W x 2-3/8"H x 8-1/2"D


• warranty: 1 year