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Pioneer 4-Channel Bridgeable Amplifier
Pioneer 4-Channel Bridgeable Amplifier 0
Pioneer 4-Channel Bridgeable Amplifier 1
Pioneer 4-Channel Bridgeable Amplifier 2
Pioneer 4-Channel Bridgeable Amplifier 3
Pioneer 4-Channel Bridgeable Amplifier 4

Pioneer 4-Channel Bridgeable Amplifier

Model #: GM-A4704
At a Glance
Pioneer 4-Channel Bridgeable Amplifier with 520 watts max power, speaker level inputs, automatic signal sensing, and Turn-ON.
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Get to know this product.

  • 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.

Useful Documents


Number of Channels4
Maximum Power Output520W
Maximum Power Output at 4 Ω80W x 4
Nominal Power (RMS) Output at 2 Ω65W x 4
Nominal Power (RMS) Output - Bridged at 4 Ω130W x 2
Total Harmonic Distortion (THD)<0.05% ( 10W, 1kHz)
Fuse Rating30A
Maximum Power Output at 2 Ω130W x 4
Maximum Power Output - Bridged at 4 Ω520W
Nominal Power (RMS) Output at 4 Ω40W x 4
Frequency Response10Hz ~ 70kHz (+0dB , -3dB)
Signal-to-Noise (SN) Ratio> 94dB


RCA Inputs4-CH
Crossover TypeAdjustable HPF/LPF
Low Pass Slope (dB/octave)-12db/oct (A/B CH)
High-Pass Slope (dB/octave)12dB/oct
Hi-Volt Input Level Control0.3V to 6.5V (RCA in), 3.0V to 26V (SP in)
Load Impedance Allowance (W)2 to 4
Protection Control SystemYes
Low-Pass Crossover Frequency80 Hz
High-Pass Crossover Frequency40-500 Hz
Automatic Signal Sensing and Turn-OnYes
Terminal TypeScrew
Dimensions (WxHxD)(inches)326(W) X 60(H) X 215(D) mm

Misc. Specs

Depth (in.)8.3811
Width (in.)12.7101
Height (in.)2.3361
Amplifier ClassClass AB
Bluetooth CapableNo
Amplifier Channels4
Impedance2 - 4 Ohms
Manufacturer Warranty1 Year
Water ResistantNo
Digital InputNo
Shallow MountNo
Speaker Level InputYes
Height (cm)5.99
Depth (cm)21.49
Width (cm)32.59