Infinity REF-551A 550-watt Monoblock Subwoofer Amplifier

Model: REF551A UPC: 050667370916 Item: 167064

Product Information

Elegance Meets Power

You can’t deny it: this is a good-looking car amplifier. But that’s not all the Infinity Reference REF-551A monoblock subwoofer amplifier has going for it. This bad boy also boasts enough power under the hood to run a serious subwoofer system. Here’s the power breakout for you: 370 watts at 4 ohms and 550 watts at 2 ohms. That’s a fair amount of power. This monoblock car amplifier can drive a high-performance subwoofer system without breaking a sweat.

You Can Keep Your Factory Radio Installed

The REF-551A subwoofer amplifier comes with the parts you need to integrate to your vehicle’s existing audio system. Simply connect the speaker wire-to-RCA adapters included with this amplifier to your car’s existing speaker wires. This pulls the appropriate audio signal and feeds it into the Infinity amplifier. Once the signal is there, tune the audio to your listening preferences using the knobs and switches on the amplifier. Simple, huh?

REF-551A Highlights:

  • Monoblock subwoofer amplifier
  • Class D technology for efficiency
  • Selectable low-pass filter
  • Includes OEM integration adapters (2 speaker wire-to-RCA adapters)
  • Aftermarket radio integration via pre-amp inputs
  • Dimensions: 9-3/8”W x 2-1/4”H x 7-5/16”D
  • Warranty: 1 year
  • Included: World Wide Stereo 60-day guarantee and expert product support


REF-551A Specifications

  • Monoblock car amplifier
  • 370 watts x 1 at 4 ohms
  • 550 watts x 1 at 2 ohms
  • Low-pass filter
  • Class D technology
  • Adjustable input level
  • Bass boost (0-9dB)
  • Phase switch (0 or 180 degrees)
  • 4-gauge power/ground inputs (wiring kit sold separately)
  • Dimensions: 9-3/8”W x 2-1/4”H x 7-5/16”D

What's in the Box

What's in the Box:

  • 1 REF-551A amplifier
  • 2 extra 30A fuses
  • 2 speaker wire-to-RCA adapters
  • 4 mounting screws
  • 1 pair of Infinity stickers
  • Owner’s manual