Infinity Reference 704A
Reference Series 4 Channel 400 Watts RMS Car Amp
Retail Price: $229.99
Your Price: $199.95
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Item Id: 11423

Infinity Reference 704A

400 Watts RMS Reference Series 4-Channel Car Amp

Infinity Reference amplifiers deliver pure power from a slim, compact chassis that’s designed to fit in more vehicles. Available in 4-channel, 5-channel, and mono models, Reference amps incorporate our latest amplifier topology, include variable electronic crossovers and bass boost control for precise system tuning, and feature high- and low-level inputs for easy interface with virtually any system. They’re also compatible with several new vehicle technologies, including many advanced driver assistance systems, and Harman HALOsonic, a suite of acoustic solutions that can simulate engine sounds for a better driving experience in hybrids and electric cars, cancel road noise for better-sounding music, and more. The Infinity Reference 704A is a 4 channel amplifier that is capable of putting out up to 400 watts RMS. The 704A is a great choice when looking to add some power to your car audio system.


4-channel class D bridgeable car amplifier
Frequency response: 10-40,000 Hz

Power Rating:

70 watts RMS x 4 at 4 ohms
100 watts RMS x 4 at 2 ohms
200 watts RMS x 2 at 4 ohms

Sound Control

Variable high and low pass filters (32-320 Hz, 12 dB/octave)

Inputs and Outputs:

Preamp (RCA) and speaker-level inputs
Preamp (RCA) outputs
ADAS and HALOsonic inputs for advanced integration in select vehicles


14-1/8" W x 2-1/4" H x 7-5/16" D


8 gauge power and ground wiring is recommended for installing this amplifier. Contact us for a discount when purchased with this amp.


1 year warranty
Amplifier Class D
Number of Channels 4
Total RMS Power Output 400
Minimum Impedance Bridged 2 ohms
Built-in Crossover High-pass (HP)
Built-in Crossover Low-pass (LP)
Bass/Gain Remote No
Preamp Outputs 1 Set