Infinity REF-704A 400-watt 4-channel Amplifier

Model: REF704A UPC: 050667370909 Item: 167067

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104 E Vine St.
Hatfield, PA 19440
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(866) 961-7781
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754 Route 309 (Bethlehem Pike)
Montgomeryville, PA 18936
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(215) 368-8343
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38 Greenfield Avenue,
Ardmore, PA 19003
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(610) 649-7002
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Product Information

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.

REF-704A Features:

Compact footprint

Infinity Reference amplifiers are designed with a compact chassis and small footprint to ease installation, even if available space is limited.

High- and low-level inputs

Speaker-level and low-level inputs allow Reference amps to work with just about any car stereo, aftermarket or factory.

Variable crossovers and bass boost

Unlike many amplifiers available at similar prices, Reference amps feature variable electronic crossovers and bass boost circuit to allow for fine-tuning.

ADAS input with channel assignment

In vehicles with ADAS warning systems, you can assign a channel to broadcast system alert messages.

HALOsonic mixing input

Reference amps can also work with the HALOsonic systems of select vehicles, which helps reduce external noise for a better sonic experience.


REF-704A Specifications:

  • 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
  • Signal-to-Noise Ratio: ≥85dB (ref 1W output @ 4Ω)

What's in the Box

What's in the Box

  • REF-704A amplifier
  • High-level input wiring harness
  • 2 spare fuses
  • 2 2-color brand stickers
  • Quick start guide


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