Infinity REF-704A 400-watt 4-channel Amplifier

Model: REF704A UPC: 050667370909 Item: 167067

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-704A 4-channel amplifier has going for it. This bad boy also boasts enough power under the hood to run your vehicle’s speaker system. Here’s the power breakout for you: 70 watts to each front speaker and rear speaker. That’s a fair amount of power. This 4-channel car amplifier can drive a high-performance system without breaking a sweat.

You Can Keep Your Factory Radio Installed

The REF-704A 4-channel speaker 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 REF-704A 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

This Infinity car amplifier allows you to do something special. You can opt to use it in either 4-channel, 3-channel, or 2-channel mode. So now maybe you’re wondering why you have so many choices. For one major reason: it allows you to adapt as you change your speaker configuration or perhaps add a small subwoofer. You may not have to worry about buying another amplifier in the future. See the power output differences under the “Specifications” tab.

REF-704A Highlights:

  • Use in either 4-channel, 3-channel, or 2-channel mode
  • Class D technology for efficiency
  • Selectable high- and low-pass filters on front and rear channels
  • 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: 14-1/8”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-704A Specifications:

  • 4-channel car amplifier
  • 70 watts x 4 at 4 ohms
  • 70 watts x 2 + 200 watts x 1 (rear channels bridged) at 4 ohms
  • 200 watts x 2 bridged at 4 ohms
  • Selectable high- and low-pass filters on front and rear channels
  • Class D technology
  • Adjustable input level
  • ADAS for integrating into select vehicle’s safety technologies
  • HALOsonic built-in for connecting to select vehicle’s HALOsonic noise cancellation/enhancement system
  • 8-gauge power/ground inputs (wiring kit sold separately)
  • Dimensions: 14-1/8”W x 2-1/4”H x 7-5/16”D

What's in the Box

What's in the Box:

  • 1 REF-704A amplifier
  • 2 extra 30A fuses
  • 4 speaker wire-to-RCA adapters
  • 4 mounting screws
  • 1 pair of Infinity stickers
  • Owner’s manual



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