Infinity REF4555A 760-watt 5-channel Amplifier

Model: REF4555A UPC: 050667370923 Item: 167061

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 REF4555A 5-channel amplifier has going for it. This bad boy also boasts enough power under the hood to run your car’s entire audio system. Here’s the power breakout for you: 45 watts to each front speaker and rear speaker (at 4-ohm) and it also delivers 500 watts (at 2-ohm) to your subwoofer. This system amplifier can drive a high-performance system without breaking a sweat.

You Can Keep Your Factory Radio Installed

The REF4555A system 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?

Don’t Lose Those Safety Features

So your new ride came with some pretty advanced technologies built into it, huh? Maybe something like lane departure or blind spot warnings? You don’t want to lose those safety features when you begin replacing components like the factory-installed radio or amplifier. The REF4555A keeps these technologies alive in select vehicles with their Advanced Driver Assistance System (ADAS) so you can keep driving safely. Don’t compromise on things like this.

One Versatile Amplifier

System amplifiers are the most versatile amplifiers that you can get. You can opt to use this Infinity car amplifier in either 5-channel or 3-channel mode. So now maybe you’re wondering why you would use it as a 3-channel amplifier. For one major reason: if you’re setting up a killer sound quality setup, you can bridge the speaker channels to push extra juice to your front speakers. How much extra juice? Well, the amplifier output jumps from 45 watts x 4 to 130 watts x 2. High-performance front speakers will LOVE the additional power and, in turn, so will you!

REF4555A Highlights:

  • Use in either 3-channel or 5-channel mode
  • Class D technology for efficiency
  • Selectable high- and low-pass filters on front and rear channels
  • Low-pass filter on subwoofer channel
  • Includes OEM integration adapters (4 speaker wire-to-RCA adapters)
  • Aftermarket radio integration via pre-amp inputs
  • Advanced Driver Assistance System (ADAS) for integrating into select vehicle’s safety technologies
  • Dimensions: 15-11/16”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


REF4555A Specifications:

  • 5-channel car amplifier
  • 45 watts x 4 + 320 watts x 1 at 4 ohms
  • 65 watts x 4 + 500 watts x 1 at 2 ohms
  • 130 watts x 2 bridged at 4 ohms + 500 watts x 1 at 2 ohms
  • Selectable high- and low-pass filters on front and rear channels
  • Low-pass filter on subwoofer channel
  • Class D technology
  • Adjustable input level
  • Bass boost on subwoofer channel (0-9dB)
  • Phase switch on subwoofer channel ( 0 or 180 degrees)
  • ADAS for integrating into select vehicle’s safety technologies
  • HALOsonic built-in for connecting to select vehicle’s HALOsonic noise cancellation/enhancement system
  • 4-gauge power/ground inputs (wiring kit sold separately)
  • Dimensions: 15-11/16”W x 2-1/4”H x 7-5/16”D

What's in the Box

What's in the Box:

  • 1 REF4555A amplifier
  • 2 extra 30A fuses
  • 4 speaker wire-to-RCA adapters
  • 4 mounting screws
  • 1 pair of Infinity stickers
  • Owner’s manual