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Infinity Reference 4555A

1800W Peak (760W RMS) Reference Series 5-Channel Amplifier

Infinity
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• 45 Watts RMS x 4 + 320 Watts x 1 @ 4 ohms
• 65 Watts RMS x 2 + 500 Watts x 1 @ 2 ohms
• Total Peak Power: 1800 Watts
• Variable Bass Boost: 0 to +9 dB
• Heavy duty aluminum alloy heat-sink for extreme heat dissipation
• Frequency Response: 32 - 320 Hz

Learn more about the ref4555a

Good news and a little bad...

This item has been discontinued

But you may be interested in the newest model that's available.

ref4555aam thumbnail

Infinity Reference 4555A (REF-4555A)

OUR PRICE: $299.95

View item

Product Highlights


• 45 Watts RMS x 4 + 320 Watts x 1 @ 4 ohms
• 65 Watts RMS x 2 + 500 Watts x 1 @ 2 ohms
• Total Peak Power: 1800 Watts
• Variable Bass Boost: 0 to +9 dB
• Heavy duty aluminum alloy heat-sink for extreme heat dissipation
• Frequency Response: 32 - 320 Hz

Description


Infinity brand icon

Authorized dealer

General Features:

  • Infinity Reference Series REF-4555A 5-Channel Amplifier
  • RMS Power Rating:
    • 4 ohms: 45 watts x 4 chan. + 320 watts x 1 chan.
    • 2 ohms: 65 watts x 4 chan. + 500 watts x 1 chan.
    • 1 ohm: ------------N/A------------
    • Bridged, 4 ohms: 130 watts x 2 chan. + 500 x 1 chan.
  • Total power output: 1800 watts
  • Pulse Width Modulated MOSFET power supply
  • LED power (green) and protect (red) indicators
  • Soft start turn-on
  • 5/4/3/2 or Mono channel operation
  • High and Low level speaker inputs
  • 3-way protection circuitry (thermal, overload, and speaker short protection)
  • Dual speaker terminals simplify the hookup of multiple speakers
  • Heavy duty aluminum alloy heat-sink for extreme heat dissipation
  • Slim and compact chassis provides more installation options
  • HALOsonic mixing input
  • Frequency Response: 32 - 320 Hz
  • Signal to Noise Ration: >80 dB
  • Total Harmonic Distortion (THD): <1.0%
  • Phase: 0 - 180°
  • Variable Bass Boost: 0 to +9 dB
  • Fuse Rating: 35 A x 3
  • 4 - 8 gauge power and ground wiring is recommended for installation. Contact us for information regarding a discount on select amplifier kits from our website when purchased together with this amplifier. Click Here for our contact information.
  • Dimensions: 15-11/16"W x 7-5/16"D x 2-1/4"H
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

What's Included

  • 1 REF-4555A 5-Channel Amplifier
  • 4 High-level input wiring harnesses
  • 2 spare fuses
  • 2 2-color brand stickers
  • Quick start guide


PROP 65 WARNING: This product can expose you to chemicals including lead and lead compounds, which are known to the State of California to cause cancer or birth defects or other reproductive harm. Wash hands after handling. For more information, visit www.P65Warnings.ca.gov

Product history:

Infinity REF-4555AAM thumbnail
(newest, current model)
Infinity REF-4555A thumbnail
(previous model, replaced by Infinity Reference 4555A (REF-4555A))
Infinity 5350A thumbnail
(previous model, replaced by Infinity Reference 4555A)

Specifications & Details


Power Specifications - Full Range Channels
RMS Power @ 4 ohms
45 watts x 4 channel
RMS Power @ 2 ohms
65 watts x 4 channel
Bridged RMS Power
130 watts x 2 channel
Power Specifications - Subwoofer Channel
RMS Power @ 4 ohms
320 watts x 1 channel
RMS Power @ 2 ohms
500 watts x 1 channel
Amplifier Specifications
Series
Reference Series
Number of Channels
5-Channel
Total Peak Power Output
1800 watts
Total RMS Power Output
760 watts
Maximum Input Gauge Size
4 AWG
Minimum Impedance Unbridged
2 ohms
Minimum Impedance Bridged
4 ohms
THD at Rated RMS Power
<1%
Speaker Level Inputs
Yes - with included adapter
Built-in Crossover
Low-Pass (LP)
High-Pass (HP)
Full (AP)
Signal-to-Noise Ratio
>80 dB
Bass Boost
0 - 9 dB
Fuse Rating
35A x 3 
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Item Details


Manufacturer:

Model Number:

REF-4555A

Weight:

10.36lbs

Internal SKU:

ref4555a

Internal Product ID:

112333

Product and How-to Videos


  • Harman International: The Pursuit of Great Sound
  • How To Install an Amplifier: Car Amplifier Basics Part 2

Customer Ratings & Reviews



5 star
80%
4 star
20%
3 star
0%
2 star
0%
1 star
0%



Durability
5
Value
5
Features
4.8
Design
5
Usability
4.6

Customer Reviews

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small and solid

I have had many JBL and Infinity products in the past (amps,speakers,subs) and the quality is the same with this amp. This amp is nice and compact and is underrated,as far as power goes. It doesn't have a ton of features, but that's fine by me. I would recommend any JBL/Infinity product.

By Brian on April 11, 2018 Checkmark Icon Verified purchase

2

found this helpful.

Awesome-always wanted this one!

The features and specs paint one picture of this amp and what it is capable of. When you open it up, it looks good (really good-discreet look), considered a paper weight until attached to the battery, radio, speakers. Then, and only then you realize the potential is realized. This amp over promises and over delivers. It has outstanding balance and very harmonious production value. Attached to 6x9 in rear deck for mids, 6x8 with cross-over with tweeters and two 12inch subs in an enclosed box. The sound is so clean (plain and simple). The ROI on purchase will over promise and over deliver.

By Get on the Bus with Gus on December 27, 2017 Checkmark Icon Verified purchase

2

found this helpful.

Awesome Amplifier!

I went full Infinity reference Amp, speakers and subwoofer. System sounds awesome, not overkill. Very satisfied.

By Justin on March 30, 2018

1

found this helpful.

Attractive amp

Amp is very sturdy with a nice weight. I doubt it's pushing 500rms at the sub. I have it powering an infinity kappa 12 at 2 ohms. Seems like the sub is starving for power. But I will say I paired them with infinity reference 6.5 doors and 6x9s deck and they sound crispy clear. I sometimes turn the sub off just to hear them.

One thing I dislike is that a standard screwdriver can not secure the wires in the terminal. You need a slender screwdriver to reach the screws. I.had to use a glasses screwdriver, but you don't get much torque. Later I'll redo it. I have not touched the ammo while operating but I'm sure it's good. Haven't had any issues and I normally play loud.

By Kev on March 8, 2018

1

found this helpful.

Clean, Solid Power

Was a shame to mount this powerhouse out of view. Another GREAT product from Infinity, straight forward install quick adjustments a beautiful unit.

By Kevin on March 6, 2018

1

found this helpful.

Add-ons


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