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Infinity Reference 551A (REF-551A)

1300W Max (550W RMS) Reference Series Class-D Monoblock 2 Ohm Stable Amplifier with High Level Input Adapters Included

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• 370 Watts RMS x 1 @ 4 ohms
• 550 Watts RMS x 1 @ 2 ohms
• Total Peak Power: 1300 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 ref551a

We apologize

This item has been discontinued

Product Highlights


• 370 Watts RMS x 1 @ 4 ohms
• 550 Watts RMS x 1 @ 2 ohms
• Total Peak Power: 1300 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-551A Monoblock Amplifier
  • RMS Power Rating:
    • 4 ohms: 370 watts x 1 chan.
    • 2 ohms: 550 watts x 1 chan.
    • 1 ohm: ------------N/A------------
  • Total power output: 1300 watts
  • Pulse Width Modulated MOSFET power supply
  • LED power (green) and protect (red) indicators
  • Soft start turn-on
  • 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: 30 A x 2
  • 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.
  • Authorized Internet Dealer

What's Included

  • 1 REF-551a amplifier
  • 2 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:

(newest, current model)
Infinity REF-551AAM thumbnail
(previous model, replaced by Infinity Reference 551AAM (551A))
Infinity 1600A thumbnail
(previous model, replaced by Infinity Reference 551A (REF-551A))
Infinity 611a thumbnail
(previous model, replaced by Infinity Reference 1600A)
Infinity 610A thumbnail
(previous model, replaced by Infinity 611A)

Specifications & Details


Power Specifications - Subwoofer Channel
RMS Power @ 4 ohms
370 watts x 1 channel
RMS Power @ 2 ohms
550 watts x 1 channel
Amplifier Specifications
Series
Reference Series
Amplifier Class
D
Number of Channels
1 - Mono
Total Peak Power Output
1300 watts
Total RMS Power Output
550 watts
Maximum Input Gauge Size
4 AWG
Minimum Impedance Unbridged
2 ohms
Minimum Impedance Bridged
Not Bridgeable
THD at Rated RMS Power
<1.0%
Speaker Level Inputs
Yes
Preamp Outputs
No
Low-Pass Crossover Frequency
32 - 320 Hz
Signal-to-Noise Ratio
>80 dB
Bass Boost
0 - 9 dB
Remote bass/level controller
No
Fuse Rating
30A x 2 
Total Fuse Rating
60
Strappable
No
Sonic Certified Amplifier
Not Tested
Amp Bluetooth Connectivity
No
Hi-Res Certified
No
What is in the box?
Paperwork
User manual
WITB: Amplifiers
Amplifier
Mounting screws (4)
Two spare fuses
Other Accessory #1
2 Speaker wire-to-RCA adapters
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Item Details


Manufacturer:

Model Number:

REF-551AAM

Weight:

7.36lbs

Internal SKU:

ref551a

Internal Product ID:

112337

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
100%
4 star
0%
3 star
0%
2 star
0%
1 star
0%



Durability
5
Value
5
Features
5
Design
5
Usability
5

Customer Reviews

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great amp

great little AMP pushes my 2 10in subs well sounds good

By mike on April 4, 2018 Checkmark Icon Verified purchase

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