Infinity Reference 551A
Reference Series 1 Channel 550 Watts RMS Car Amp
Retail Price: $229.99
Your Price: $199.95
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Item Id: 11428

Infinity Reference 551A

550 Watts RMS Reference Series 1-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. 

The Infinity Reference 551A is a 1 channel amplifier that is capable of putting out up to 550 watts RMS. The 551A is a great choice when looking to power a subwoofer.


1-channel class D bridgeable car amplifier
Frequency response: 10-320 Hz

Power Rating:

370 watts RMS x 1 at 4 ohms
550 watts RMS x 4 at 2 ohms

Sound Control

Variable low pass filters (32-320 Hz, 12 dB/octave)
Dynamic Bass Optimizer with bass boost (0-9 dB at 45 Hz)
Phase switch

Inputs and Outputs:

Preamp (RCA) and speaker-level inputs


9-3/8" 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 1
Total RMS Power Output 550
Minimum Impedance Bridged 2 ohms
Built-in Crossover Low-pass (LP)
Bass/Gain Remote No
Preamp Outputs No