About the Pioneer GM-A4704
Plays loud and clear
Plays loud and clear
Why put an amplifier in your car? Pioneer's GM-A4704 4-channel amplifier will greatly improve the sound quality in your vehicle, so you'll find yourself looking forward to your time on the road. This punchy Pioneer will power your front and rear speakers with 40 watts RMS each, which is actually a large jump over the power supplied by a typical car radio. You'll hear much more of the little details in your music, especially when you turn your system up to overcome road noise.
Here's why lots of people start building their systems with a 4-channel amp. You can run your front speakers with the front channels (A) on this Pioneer, then combine the rear channels (B) to drive a subwoofer. Then, when you've got enough cash to buy a second sub and a dedicated amp for your bass, you can use your 4-channel to run all your speakers. You can also put this versatile amp into 2-channel mode to send up to 130 watts RMS each to a couple of component speakers or subwoofers.
The front channels sport variable high-and low-pass filters so you can better adjust the sound for critical front soundstaging or a finely-tuned bass. Switchable high- and low-pass filters on the rear channels help take the rumble away from full-range speakers or the sizzle away from a sub. Speaker-level inputs allow you to add the GM-A4704 to a factory system. If your vehicle needs a sonic upgrade, this amp's performance features and reasonable price make it a great choice.
- 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
- 8-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
- MFR # GM-A4704
What's in the box:
- 4-Channel amplifier
- 30A ATO fuse (installed)
- Speaker-level input harness with eight 4" wires
- 4 Self-tapping screws (3/4" length)
- Owner's Manual (Eng / Fren)
- Owner's Manual (Span)
- Warranty sheet
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More details on the Pioneer GM-A4704
Features & specs
|RMS Power Output (Watts x Channels)||
40 x 4 |
|Peak Power Output (Watts x Channels)||---|
|Power at 2 Ohms (Watts x Channels)||65 x 4|
|Bridged Power (Watts x Channels)||130 x 2|
|Minimum Impedance Bridged||4|
|Minimum Impedance Unbridged||2|
|Best Frequency Response||10-70k Hz|
|THD at Rated RMS Power||1%|
|Signal to Noise Ratio||78 dB|
|Low-Pass Crossover Frequency||80Hz|
|Low-Pass Slope (dB/octave)||12 dB/octave|
|High-Pass Crossover Frequency||40-500(A), 80Hz(B)|
|High-Pass Slope (dB/octave)||12 dB/octave|
|Bass Boost Frequency||N/A|
|Speaker Level Inputs||Yes|
|Parts Warranty||1 Year|
|Labor Warranty||1 Year|
CEA-2006 Compliant: CEA-2006 is a system of testing and measurement methods for mobile audio amplifiers. This voluntary standard advocates a uniform method for measuring an amplifier's RMS power output and signal-to-noise ratio. The criteria for measuring power uses a DC input voltage of 14.4 volts and the RMS power output is measured into a 4Ω load, with 1% or less Total Harmonic Distortion plus noise (THD+N), and over a frequency range of 20 Hz to 20 kHz (for full range amplifiers). Signal-to-Noise ratio is measured in weighted absolute decibels (dBA) at a reference of 1 watt into 4Ω. CEA-2006 standards allow consumers to compare amplifiers on an equal basis. Using CEA-2006 criteria, the Pioneer GM-A4704 is rated at 40 watts RMS x 4 channels, with a 78 dBA signal to noise ratio.
Specifications: The manual also lists these non CEA-2006 compliant specifications:
- 2Ω: 65 watts x 4 channels (14.4 volts, 1 kHz, no more than 1% THD+N)
- Bridged: 130 watts x 2 channels (into 4Ω, 14.4 volts, 1 kHz, no more than 1% THD+N)
- Signal to Noise Ratio: 94 dB (at rated power)
Gain Control: To accommodate the varying range of signal levels coming from today's factory and aftermarket radios, the input gain is adjustable (0.3V-6.5V line level, 3V-26V speaker level). The front (Channel A) and rear (Channel B) inputs have separate gain controls.
LPF/HPF: The amplifier has independent crossovers for the front (Channel A) and rear (Channel B) outputs. Each crossover can be set to LPF (Low-Pass Filter), HPF (High-Pass Filter), or Off (All-Pass). The crossover point for the high-pass filter on Channel A is variable between 40Hz and 500Hz, adjustable via a rotary control. The crossover point for high-pass filter on Channel B and both low-pass filters is fixed at 80Hz. The slope for all crossovers is 12dB/octave.
Power Connections: The power and ground connections are 0.54" wide screw terminals, the remote turn-on screw terminal is 0.325" wide. A Phillips-head or flat blade screw driver (not included) is required to tighten/loosen the terminals. With a total fuse rating of 30 amps, 8 AWG power and ground wire is recommended. A 30A fuse should be placed on the power wire within 18" of the battery. Spade connectors are recommended for the power, ground, and remote wires.
Speaker Connections: The speaker screw terminals are 0.325" wide. A Phillips-head or flat blade screw driver (not included) is required to tighten/loosen the terminals. Spade connectors are recommended for the speaker wires.
RCA Input: The amplifier features two pairs of stereo RCA line level inputs (Channel A left/right and Channel B left/right). The Input Select switch lets you set the amplifier for 2-Channel or 4-Channel Input. If set to 2-Channel, the input signal from Channel A left/right will be sent to all four channels.
Speaker Input: The included speaker level input harness allows you to connect your OEM radio (or aftermarket radio that does not have the typical RCA-type outputs) without having to buy an adapter. When the speaker input harness is used, the amplifier is set to 4-Channel mode automatically.
Auto Power On: When using the speaker level input, a circuit senses the input signal and turns the amp on automatically. This feature makes it easier to add an amplifier to a factory radio or to a receiver with no preamp outputs.
Fuse: The amp is protected by one 30-amp ATO blade fuse.
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