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• 4-Channel amplifier
• 30A ATO fuse (installed)
• 2-Channel amplifier
• 25A ATO fuse (installed)
• (2) Speaker-level input harness with eight 4" wires
• (8) Self-tapping screws (3/4" length)
• Owner's Manual (Eng / Fren)
• Owner's Manual (Span)
• Warranty sheet
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.
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.
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.
30A ATO fuse (installed)
25A ATO fuse (installed)
(2) Speaker-level input harness with eight 4" wires
(8) Self-tapping screws (3/4" length)
Owner's Manual (Eng / Fren)
Owner's Manual (Span)
GM-A4704 - 4-Channel A Series Bridgeable Class AB 2-Ohm Stable Car Amplifier 520W Peak Power
Fuse Rating: 30
Width (inches): 12-1/16
Input Voltage: 14.4v
Signal to Noise Ratio: 78 dB
Minimum Impedance Unbridged: 2
Bass Boost: No
Low-Pass Slope (dB/octave): 12 dB/octave
Best Frequency Response: 10-70k Hz
RMS Power Output (Watts x Channels): 40 x 4
Power at 2 Ohms (Watts x Channels): 65 x 4
Bridged Power (Watts x Channels): 130 x 2
Low-Pass Crossover Frequency: 80Hz
Preamp Outputs: No
THD at Rated RMS Power: 1%
Bass Boost Frequency: N/A
Peak Power Output (Watts x Channels): N/A
Minimum Impedance Bridged: 4
Amplifier Class: AB
High-Pass Crossover Frequency: 40-500(A), 80Hz(B)
High-Pass Slope (dB/octave): 12 dB/octave
Fan Cooled: No
Speaker Level Inputs: Harness
Height (inches): 2-3/8
Depth (inches): 8-1/2
GM-A3702 - 2-Channel Bridgeable Amplifier, 500 Watts Max Power, Hi-Volt input level control, Automatic signal sensing and Turn-ON
Number of Channels2
Amplifer ClassClass AB
Maximum Power Output500W
Maximum Power Output at 2 Ohms250W x 2
Maximum Power Output at 4 Ohms170W x 2
Maximum Power Output - Bridged at 4 Ohms500W
Nominal Power (RMS) Output at 2 Ohms95W x 2
Nominal Power (RMS) Output at 4 Ohms60W x 2
Nominal Power (RMS) Output - Bridged at 4 Ohms190W x 1
Frequency Response10Hz ~ 70kHz
Total Harmonic Distortion (THD)<0.05 %
Signal-to-Noise (SN) Ratio >95 dB
Speaker Level Inputs
Low-Pass Crossover Frequency80Hz
Low Pass Slope (dB/octave)-12db/oct
Automatic Signal Sensing and Turn-On
Hi-Volt Input Level Control0.3V to 6.5V (RCA in), 3.0V to 26V (SP in)
Terminal TypeScrew-Type Terminal
Load Impedance Allowance (Ohm)2 to 4
Protection Control System
Dimensions (WxHxD)(inches)246(W) X 60(H) X 180(D) mm
Authorized Internet Dealer
Warranty: 1 Year Onlinecarstereo.com warranty.
1 Year warranty from Onlinecarstereo.com implies that repairs must be returned to Onlinecarstereo.com, not the manufacturer. More information can be found in our help section under returns & warranties. What's not covered : Misuse, abuse, defacement, physical damage of any kind, and improper installation / operation. Video and multimedia equipment with damaged or cracked screens.Subwoofers and speakers are not warrantied if the defect is due to physical damage.
Estimated Shipping Time for Special Order items is 1-3 weeks.
You may call our Customer Service Department at 310-526-8635 for a more accurate shipping estimate.
Special Order Product
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Or, call us for alternatives at 310-526-8635
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3. Price matching is only applicable in new orders.
4. Limit one price match per identical item per customer.
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All your purchase from our store comes with Free Lifetime Technical Support. Please call our certified technicians at 310-874-3313 for any questions about your product.
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