Infinity REF-551A Monoblock Subwoofer Amplifier — 550W RMS (2Ω), 1300W Peak

Built to drive a single subwoofer with authority, the Infinity REF-551A monoblock delivers powerful, tunable low-end and is compatible with both aftermarket and factory head units thanks to its speaker-level and low-level inputs. Installers can fine-tune the output with the amplifier’s variable electronic crossovers and on-board bass boost circuit for precise bass control. For vehicles equipped with advanced driver assistance systems, the REF-551A includes an ADAS input with channel assignment so system alerts can be routed through a dedicated channel. It also supports HALOsonic mixing input found on select vehicles to help compensate for exterior noise and improve listening clarity. What’s in the Box: 1 amplifier; High-level input wiring harness; 2 spare fuses; 2 2-color brand stickers; Quick start guide. REF-551A Specifications Max Power: 1300W Peak Power Output 2Ω: 550W RMS x 1 <1.0% THD+N 4Ω: 370W RMS x 1 <1.0% THD+N Signal-to-Noise Ratio: >80dB (ref 1W output @ 4Ω)