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Reference 704A

Reference 704A

Series of high-performance mono, 4-, and 5-channel amplifiers

Getting started with your Reference 704A

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Product Specifications

Signal-to-Noise Ratio
≥85dB (ref 1W output @ 4Ω)
Max Power
1000W Peak
Power Output, 2Ω
100W RMS x 4, <1.0% THD+N
Power Output, 4Ω
70W RMS x 4, <1.0% THD+N
Power Output, 4Ω Bridged
200W RMS x 2, <1.0% THD+N

Pure power from a compact amplifier

New 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.

Infinity Reference amplifiers are designed with a compact chassis and small footprint to ease installation, even if available space is limited.
Speaker-level and low-level inputs allow Reference amps to work with just about any car stereo, aftermarket or factory.
Unlike many amplifiers available at similar prices, Reference amps feature variable electronic crossovers and bass boost circuit to allow for fine-tuning.
In vehicles with ADAS warning systems, you can assign a channel to broadcast system alert messages.
Reference amps can also work with the HALOsonic systems of select vehicles, which helps reduce external noise for a better sonic experience.

Images & Videos

Reference 704A - Silver - Series of high-performance mono, 4-, and 5-channel amplifiers - Hero
  • Reference 704A - Silver - Series of high-performance mono, 4-, and 5-channel amplifiers - Hero
  • Reference 704A - Silver - Series of high-performance mono, 4-, and 5-channel amplifiers - Detailshot 1
  • Reference 704A - Silver - Series of high-performance mono, 4-, and 5-channel amplifiers - Detailshot 2
  • Reference 704A - Silver - Series of high-performance mono, 4-, and 5-channel amplifiers - Detailshot 3

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