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Infinity Reference 475a R/B

(Factory Refurbished) 468W Max, Reference Series Class AB 4-Channel Amplifier (REF475A)

4.5

(4 reviews)

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The product on this page is discontinued.
This product is Factory Refurbished.
  • Reference Series Class AB 4-Channel Amplifier
  • RMS Power Rating:
    • 4 ohms: 75 watts x 4 chan.
    • 2 ohms: 90 watts x 4 chan.
    • Bridged, 4 ohms: 180 watts x 2 chan.
  • Max power output: 117 watts x 4 chan.
  • MOSFET power supply
  • LED power and protection indicators
  • Tuned Bass EQ (0-6 dB bass boost at 50 Hz)
  • IMS inputs allows connection to other Infinity expansion products
  • Gold-plated preamp RCA outputs
  • DC, overheat, over or under voltage, and short circuit amplifier protection
  • Gold-plated RCA level inputs
  • Variable high-pass filter (32-320 Hz, 12 dB/octave)
  • Variable low-pass filter (32-320 Hz, 12 dB/octave)
  • CEA-2006 compliant amplifier
  • Frequency response: 20-20000 Hz
  • Efficiency: 85 dB
  • Dimensions: 14-3/4"L x 9"W x 2-11/16H
  • 4-gauge power and ground leads recommended. Contact us for information regarding a discount on a select amplifier kit when purchased together.
  • Factory refurbished with full 1-year exchange warranty. The warranty on the refurbished model is actually better than the new one. Within 1-year we will exchange the amplifier if a defect occurs, and with the new model it is only for the first 30 days.
Power Specifications - Full Range Channels
RMS Power @ 4 ohms75 watts x 4 channels
RMS Power @ 2 ohms90 watts x 4 channels
RMS Power @ 1 ohmNot Stable
Bridged RMS Power180 watts x 2 channels
Peak Power Output117 watts x 4 channels
Amplifier Specifications
Amplifier ClassAB
Number of Channels4
Total Peak Power Output468 watts
Total RMS Power Output360 watts
Maximum Input Gauge Size4 AWG
Minimum Impedance Unbridged2 ohms
Minimum Impedance Bridged4 ohms
THD at Rated RMS Power1%
Speaker Level InputsNo
Preamp Outputs1 pair
Built-in CrossoverLow-pass (LP)
High-pass (HP)
High-Pass Crossover Frequency32 - 320 Hz
Low-Pass Crossover Frequency32 - 320 Hz
Subsonic FilterN/A
Signal-to-Noise Ratio85 dB
Channel SeparationN/A
Bass Boost0 - 6 dB
Bass/Gain RemoteNo
Fan CooledNo
Fuse Rating35A x 2 
CEA-2006 CompliantYes
Warranty and Return Policy
Return Policy Standard Return Policy
Parts Warranty Duration1 year
Labor Warranty Duration1 year
Warranty ProviderSonic Electronix
Customer Review Summary for Infinity Reference 475a R/B
Average Customer Rating is 4.5 out of 5 stars:
4.5
based on 4 Reviews
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Rating Distribution:
5 star:
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50%
4 star:
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3 star:
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what's this?
Average Attributes Rating:
Durability
4.3
Value
5.0
Features
4.8
Design
3.8
Usability
4.8
what's this?
Most Helpful Customer Reviews:
November 15, 2009 Awesome Amp!
Review by
newbwrx from Oregon
Overall
Durability
Value
Features
Design
Usability
This amp was a great deal through Sonic. I have owned for 6 months and it has been trouble free.
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March 11, 2009 Great Buy!!
Review by
Patrick from Lake Charles, LA
Overall
Durability
Value
Features
Design
Usability
I have had this amp for around 6 months now and to tell you the truth i was a little sceptical about buying a refurbished amp but no problems yet. i have had it in 3 vehicles now a 92 gmc 1500, a 03 honda civic ex, and now in a 99 honda civic si. in the 03 civic i totaled it (flipped 5 times) luckily no one was hurt (i was the only one involved lol) and the amp still plays like a dream althouth it does get a lil hot but no big deal plays very clean and clear nice improvement even with stock speakers.
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February 17, 2009 Infinity Reference 475a. Good Value!
Review by
DAshley33 from Cincinnaiti, Ohio
Overall
Durability
Value
Features
Design
Usability
Nice amp. 75 watts 4 channel. Has good crisp sound up to max. No distortion. I'm about to buy an Infinity sub amp and 12" woofer. I like the way the amp puts out blue light to dress up my trunk. I would recommend this amp!
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December 28, 2008 Nice Amp. Refurb is okay.
Review by
Alex from Portland, OR
Overall
Durability
Value
Features
Design
Usability
This amp works great powering 4 Infinity Kappa 5 1/4" speakers. Being a refurb, it looks a little rough. The snap off/on cover on mine was held in place with hot glue as a couple of the connectors were broken. Can't see it but I wasn't very impressed with that. Great price though if you don't care about cosmetics.
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Product Summary

Manufacturer: Infinity
Model number: 475a-RB
Weight: 14.00 lbs
Internal SKU: LS-475a-RB
Internal product ID: 13285
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Customer Testimonial

I had good contact through email including a tracking number allowing me to plan for my package's arrival. Overall, this was a good experience and i won't hesitate purchasing through Sonic Electronix again.

- Nick from North Carolina

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