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Infinity Reference 704A

1000W Peak (400W RMS) Reference Series 4-Channel Amplifier

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• 70 Watts RMS x 4 @ 4 ohms
• 100 Watts RMS x 4 @ 2 ohms
• Total Peak Power: 1000 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 ref704a

Good news and a little bad...

This item has been discontinued

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

ref704aam thumbnail

Infinity Reference 704A

OUR PRICE: $179.95

View item

Product Highlights


• 70 Watts RMS x 4 @ 4 ohms
• 100 Watts RMS x 4 @ 2 ohms
• Total Peak Power: 1000 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-704A 4-Channel Amplifier
  • RMS Power Rating:
    • 4 ohms: 70 watts x 4 chan.
    • 2 ohms: 100 watts x 4 chan.
    • 1 ohm: ------------N/A------------
    • Bridged, 4 ohms: 200 watts x 2 chan.
  • Total power output: 1000 watts
  • Pulse Width Modulated MOSFET power supply
  • LED power (green) and protect (red) indicators
  • Soft start turn-on
  • 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: 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
  • 1-year Manufacturer's Warranty

What's Included

  • 1 REF-704A 4-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 REF704AAM thumbnail
(newest, current model)
Infinity Reference 704A thumbnail
(previous model, replaced by Infinity Reference 704A)
Infinity 475a thumbnail
(previous model, replaced by Infinity Reference 704A)
Infinity 7541A thumbnail
(previous model, replaced by Infinity Reference 475a)

Specifications & Details


Power Specifications - Full Range Channels
RMS Power @ 4 ohms
70 watts x 4 channel
RMS Power @ 2 ohms
100 watts x 4 channel
Bridged RMS Power
200 watts x 2 channel
Amplifier Specifications
Series
Reference Series
Number of Channels
4-Channel
Total Peak Power Output
1000 watts
Total RMS Power Output
400 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
30A x 2 
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Item Details


Manufacturer:

Model Number:

Reference 704A

Weight:

9.13lbs

Internal SKU:

ref704a

Internal Product ID:

112335

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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$80 off other shops and infinity to boot

I upgraded my 2015 altima with infinity speakers so when this amp was on special it made perfect sense to finish off upgrade with it . Everything I has gotten from Sonic has been great so easy choice

By jeff on April 18, 2018

1

found this helpful.

Best 4 channel amp

This amp is a little monster. It puts out more than enough power. Small and very easy to install. Highly recommend. Thanks Sonic Electronix for always having great deals.

By Jair13 on April 8, 2018

1

found this helpful.

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