© 2015 HARMAN International Industries, Incorporated. All rights reserved. Infinity is a trademark
of HARMAN International Industries, Incorporated, registered in the United States and/or other
countries. Features, specifications and appearance are subject to change without notice.
HARMAN International Industries, Incorporated
8500 Balboa Boulevard, Northridge, CA 91329 USA
www.infinityspeakers.com
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 the Reference amps feature variable electronic
crossovers and bass boost circuit to allow for fine-tuning.
ADAS Input
The full range Reference amplifier feature an ADAS input which overrides the audio signal when
connected to ADAS accessories. In addition, ADAS alert routing location can be assigned during
amplifier setup using the panel mounted control.
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.
What’s in the Box:
REF-551a
1 REF-551a amplifier
2 High-level input wiring harnesses
2 spare fuses
2 2-color brand stickers
Quick start guide
REF-704a
REF-704a amplifier
4 High-level input wiring harnesses
2 spare fuses
2 2-color brand stickers
Quick start guide
REF-4555a
1 REF-4555a amplifiers
4 High-level input wiring harnesses
2 spare fuses
2 2-color brand stickers
Quick start guide
Technical Specifications:
REF-551a
High-performance mono car amplifier
Compact design to fit in more vehicles
High- and low-level inputs to work with virtually any stereo
Variable crossovers and bass boost
Max Power: 1300W Peak
Power Output, 2Ω: 550W RMS x 1, <1.0% THD+N
Power Output, 4Ω: 370W RMS x 1, <1.0% THD+N
Signal-to-Noise Ratio: ≥80dB (ref 1W output @ 2Ω)
REF-704a
High-performance 4-channel car amplifier
Compact design to fit in more vehicles
High- and low-level inputs to work with virtually any stereo
Variable crossovers
Compatibility with advanced vehicle technologies
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)
REF-4555a
High-performance 5-channel car amplifier
Compact design to fit in more vehicles
High- and low-level inputs to work with virtually any stereo
Variable crossovers and bass boost
Compatibility with advanced vehicle technology
Max Power: 1800W Peak
Full Range Channels
Power Output, 2Ω: 65Wrms x 4, <1.0% THD+N
Power Output, 4Ω: 45Wrms x 4, <1.0% THD+N
Power Output, 4Ω Bridged: 130Wrms x 2, <1.0% THD+N
Signal-to-Noise Ratio: ≥85dB (ref 1W output @ 4Ω)
Subwoofer Channel
Power Output, 2Ω: 500Wrms x 1, <1.0% THD+N
Power Output, 4Ω: 320Wrms x 1, <1.0% THD+N
Signal-to-Noise Ratio: ≥80dB (ref 1W output @ 2Ω)
Reference Amplifiers
Series of high-performance mono, 4-, and 5-channel amplifiers
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