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Infinity Reference 475a

468W Reference Series Class AB 4-Channel Amplifier

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List price $279.95

$149.99

with warranty

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In Stock. Only 3 Left!

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Bundled Savings with this Product

=

25% Off a 4 Gauge Amp Kit with Purchase!

Save 25% off the Belva BAK44 install kit, you will need an amp kit to install your amp, and this the perfect kit for your amp!

12.50

9712

292

Infinity Reference 475a

$149.99

+

25% OFF

Belva BAK44

$49.99

Special Price $37.49 ($49.99 if purchased separately)

Belva BAK44

• Complete 4 Gauge 4-Channel Amplifier Installation Kit
• Designed Specifically For Car Audio Systems Up to 1000 Watts RMS
• Premium Power and Ground Wire Provides Optimal Power Transfer

(Offer 1 of 1)

Combined Total Price

$187.48

You Save $12.50

  • 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.
  • Authorized Internet Dealer
  • 1 year Manufacturer's warranty

Product History:

Infinity 475a thumbnail
(newest, current model)
Infinity 7541A thumbnail
(previous model, replaced by Infinity Reference 475a)

Power Specifications - Full Range Channels

RMS Power @ 4 ohms

The RMS power rating is the measure of continuous power that an amplifier can output, or a speaker can handle. It is the most accurate depiction of real, continuous power that the industry has so far.

If the final impedance of your speakers or subwoofers equals 4 ohms, this is how much power this amplifier will supply at that ohm level. The higher the RMS wattage, the more clean and loud your music will sound.

75 watts x 4 channels
RMS Power @ 2 ohms

The RMS power rating is the measure of continuous power that an amplifier can output, or a speaker can handle. It is the most accurate depiction of real, continuous power that the industry has so far.

If the final impedance of your speakers or subwoofers equals 2 ohms, this is how much power this amplifier will supply at that ohm level. The higher the RMS wattage, the more clean and loud your music will sound.

90 watts x 4 channels
RMS Power @ 1 ohm

The RMS power rating is the measure of continuous power that an amplifier can output, or a speaker can handle. It is the most accurate depiction of real, continuous power that the industry has so far.

If the final impedance of your speakers or subwoofers equals 1 ohm, this is how much power this amplifier will supply at that ohm level. The higher the RMS wattage, the more clean and loud your music will sound.

Not Stable
Bridged RMS Power

Bridging refers to combining two channels on an amplifier to create one channel with double the voltage and an increased power output. A 2-channel amplifier will bridge down to 1-channel and a 4-channel amplifier can bridge to create 2-channels. An amplifier is most commonly bridged to drive a subwoofer.

Remember, once you bridge two channels down to one its final impedance will be 4 ohms unless otherwise specified. This rating lists the RMS power created once an amplifier is bridged.

180 watts x 2 channels
Peak Power Output
This form of power rating refers to the maximum amount of power an electronic device can handle or output in an instant without damage occurring. Often times this maximum is achieved during a brief musical burst, such as a drum accent, or low bass hit.

Some manufacturers display peak power ratings on the face of their products to increase the appeal to consumers. The RMS power rating is more accurate, and we recommend using it for product comparison.

117 watts x 4 channels

Amplifier Specifications

Amplifier Series
This designates the series of the amplifier. Many amps are available in a litany of different wattage and channel configurations, but maintain consistent features throughout the product line.
Reference (Infinity)
Amplifier Class

An amplifier increases the power of the signal being fed to it by taking energy from its power supply and matching the signal but increasing its amplitude. Amplifiers use many different methods for converting these electrical signals and have been categorized into classes.

Class A/B: Greater than 50% of the input signal is amplified while the other percentage is “off”. These amplifiers have a small amount of current flowing through the output transistors all the time which almost eliminates crossover distortion. Class A/B has great sound quality but is not as efficient as class D. These amps are most commonly used to drive speakers.

Class D: Also known as switching amplifiers, class D amps have output transistors that are completely turned “on” or “off”. This means that when the transistors are on, there is almost no voltage across them but when they are off there is significant voltage but no current flowing through it which makes these amplifiers very efficient at the cost of sound quality. These amps are most commonly used to drive subwoofers.

Other Classes: You may see classes such as GH, bD, X, FD, etc. by some manufactures. These amplifiers tend to be either class A/B, D or a hybrid of the two but with improvements to their designs that can make them more efficient or offer better sound quality.

AB
Number of Channels
Each channel on an amplifier will power one speaker using a positive and negative cable. There are various types of amplifiers, each designed to power a certain number of speakers. Monoblock amplifiers, also known as single channel, are designed to power one or more subwoofers. These amplifiers often have very high power ratings. On the other hand, multi-channel amplifiers power multiple speakers, usually at lower power ratings. 2-Channel and 4-Channel amplifiers can power car speakers or low powered subwoofers. Occasionally you might see a 5 or 6-channel amplifier that can power speakers and subwoofers at the same time. The most common setup is a monoblock amp to run subwoofers and a 4-channel amp to run door speakers. Check out our Knowledge Base for more information.
4
Total Peak Power Output
The total peak power output is measured as the wattage per channel multiplied by the number of channels, and is calculated at the lowest level of operating impedance.

It is measured during a brief musical burst, such as a sudden drum accent. Some manufacturers display peak power ratings on the face of their products to increase the appeal.

The RMS power rating is more accurate, and we recommend using it for product comparison.

468 watts
Total RMS Power Output
Total RMS power is measured by multiplying RMS power per channel by the number of channels, and is calculated at the lowest level of operating impedance.

RMS power is the amount of continuous power, measured in watts, that an amplifier produces is called RMS power. The higher the RMS figure, the louder and cleaner your music sounds.

The RMS output figure is much more accurate than the peak rating when comparing products.

360 watts
Maximum Input Gauge Size
This is the largest gauge wire that will fit into the power and ground terminals of this device. The lower the gauge number, the thicker the wire is. For example, a 4 gauge wire is thicker than an 8 gauge wire and thus has higher current carrying capacity. Always do your best to get this size wire to reduce the risk of damage to your components.
4 AWG
Minimum Impedance Unbridged
The lowest impedance the amplifier will handle when it is not bridged.
2 ohms
Minimum Impedance Bridged
The lowest impedance the amplifier will handle when it is bridged.
4 ohms
THD at Rated RMS Power
The amount of change in harmonic content of the signal as it is amplified. A lower figure indicates less change and a more accurate amp. THD below 0.10% is inaudible.
1%
Speaker Level Inputs
Speaker level inputs are commonly referred to as high-level inputs and vice versa. This input type allows you to get your audio signal directly from the speaker wire in your vehicle, instead of using RCA cables. The advantage of this is factory integration, as most stock radios do not have RCA outputs to run amplifiers.
No
Preamp Outputs
Many amplifiers are equipped with RCA preamp outputs which pass the original music signal from the source to additional amplifiers. This is known as daisy chaining because the source connects to the first amp, and the first amp connects to the second amp, etc. The advantage to daisy chaining is you only need one 2-channel RCA cable to transfer the signal from the head-unit to the amplifier, and then one additional cable for each amp being daisy chained.
1 pair
Built-in Crossover

A crossover is a type of filtering system that permits only certain frequencies to play. A Low-Pass (LP) crossover allows only frequencies below its setting to get through which is good in the case of some subwoofers. A High-Pass(HP) filter allows frequencies above its setting to pass through, this is normally used on speakers.

When a crossover is set to FULL it means no filtering is added and the full frequency spectrum is allowed through the amplifier. Filtering is important because feeding a speaker frequencies it cannot reproduce effectively creates distortion.

Low-pass (LP)
High-pass (HP)
High-Pass Crossover Frequency
The high-pass crossover frequency can be a fixed crossover point or a variable crossover range. A variable high-pass crossover allows you to select a specific crossover point which allows frequencies above the set crossover point to pass, while making frequencies below the set point gently or harshly roll-off, depending on the steepness of the slope.

The steepness of the roll-off slope is measured in dB/octave and refers to the rate of attenuation (lowering of volume) outside their pass bands.

32 - 320 Hz
Low-Pass Crossover Frequency
The low-pass crossover frequency is typically used for subwoofers. It can be a fixed crossover point or a variable crossover range. A variable low-pass crossover allows you to select a specific crossover point which allows frequencies below the set crossover point to pass, while making frequencies above the set point gently or harshly roll-off, depending on the steepness of the slope.

The steepness of the roll-off slope is measured in dB/octave and refers to the rate of attenuation (lowering of volume) outside their pass bands.

32 - 320 Hz
Signal-to-Noise Ratio
This spec compares the strength of the signal to the level of background noise. A higher value indicates less background noise.
85 dB
Bass Boost
The objective of the bass boost is to get more kick out of your subwoofer. It is a circuit that emphasizes the lower frequencies at a given point. The bass boost should always be set first before setting the gain. This feature is known for destroying subwoofers and is commonly used incorrectly, so be cautious.
0 - 6 dB
Bass/Gain Remote
If the amp comes with a bass/gain remote you will be able to control the level of your bass from your dashboard. Typically bass remotes also include a 16-20 ft. wire for installation.
No
Fan Cooled
A great feature to have if an amp generates a large amount of heat. Cooling fans can help regulate the temperature to prevent the amp from overheating (burning).
No
Fuse Rating
The amperage and the number of fuse(s) an amp requires.
35A x 2 
CEA-2006 Compliant
Amplifiers that have been tested to meet specific standards. When a car amplifier meets these standards, you can be sure that it will be able to produce the amount of power specified by the official CEA-2006 rating. Usually, these rating consist of the following items:
  • RMS Power
  • Signal-to-Noise Ratio

This rating applies to both external car amplifiers, as well as the amplifiers inside of in-dash stereos.

Yes

Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
65%
4 Star
20%
3 Star
15%
2 Star
0%
1 Star
0%

Average Attribution Rating

Durability
4.0
Value
4.5
Features
4.5
Design
4.2
Usability
4.6

Dalton

Marlin, TX

Overall
Durability
Value
Features
Design
Usability

Great Quality Reliable Amp!!!

October 5, 2013

This is the second Infinity 475a I've purchased and installed, the first was almost 7 years ago and hasn't given me any trouble and it's been in two different trucks I've owned. It's always been pushing Infinity Reference or Kappa Speakers and has done a great job. So I bought another one to install in my little brothers truck and hopefully I will get the same results!!! The amp gets a little hot to the touch but that was to be expected having no active cooling. But the amp has NEVER shut off on me!!! It's got great simple adjustments and the build quality seems solid. Would highly recommend, it's a great amp for the money!!!

0 of 0 found this helpful

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Mathieu

Canada

Overall
Durability
Value
Features
Design
Usability

Great Value!

December 26, 2012

The amp are easy to plug and give a good sound ! Great product!

0 of 0 found this helpful

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Alex

Chicago, IL

Overall
Durability
Value
Features
Design
Usability

Does the job

March 26, 2012

I bought my first 475a five years ago. I built a custom mount for it in my car and wired everything up. It performs very well. It can drive strong power to everything I have (Kappa speakers). However, I had to replace it last year as 1, and then 2 channels died on the unit. I have it protected by fuses and I've never blown one. The biggest concern with this unit is the exterior heat it can generate. If you listen to moderate loud music (imagine comfortably hearing music on the highway with your windows down) for more than 15 minutes, you will not be able to touch this unit with your hands. I can't speak on the effect of this heat on the circuitry inside, but i speculate it pushes some components very close to their threshold. Lots of options (but an aesthetically dumb design by not making them more exposed). Also wish the controls could be easier handled without tools.

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Jason

Canada

Overall
Durability
Value
Features
Design
Usability

Not Too Bad

September 5, 2011

Recently ordered this amp from Sonic. Shipping was fast and customer service was great. Finally got around to hooking it up and although I have not pushed it to hard as yet it sounds pretty good for an "entry level" amp. Signal to noise ratio isn't exactly the best as there is some hiss but so far it gives off pretty good power. Running it in tri way mode. Powering a set of components up front and a sub in the rear. Good enough for a daily system but not for a high sound quality build.

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JustM3

Houston Tx

Overall
Durability
Value
Features
Design
Usability

Great Amp

July 23, 2011

I had this amp connected in my now wife's car in the trunk in Texas Heat.. and it was a great product, never went into protect. Look guys, this is a front stage and rear fill unit.. not really meant for Subs.. of course it's gonna overheat like that.

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Sonicelectronix=amazing

Las Vegas, Nevada

Overall
Durability
Value
Features
Design
Usability

Sounds Excellent!!

March 4, 2011

I have this amp pushing 4 Infinity Kappa 682.9cf, in my little 2 door truck. It sounds so loud in a little truck!! Excellent high's and mids! I don't know anybody with a better system! Also, have 2 10inch JL W3 subs to balance it out.

0 of 0 found this helpful

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Heckler

Wa.

Overall
Durability
Value
Features
Design
Usability

Awsome amp!

July 19, 2010

This amp drives the heck out of my Infinity Kappa's. I have the amp turned down turned almost all the way down because it's too loud! Awesome!!!

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John

North Reading, MA

Overall
Durability
Value
Features
Design
Usability

Best in its class

May 22, 2010

$30 off list price isn't one of the better deals on Sonic, but I think this amp is currently being phased out, so get it while it lasts. And it's CEA certified, so you know you're getting exactly what's on the spec sheet. At 75 watts RMS, it's enough to amp your music as loud as your ears can tolerate, and then louder. It's fairly easy to use with an intuitive design, and is definitely one of the sexiest looking amps out there (and the blue lights look awesome). The biggest downside is the 1% distortion. But if you're thinking about buying this amp, you're probably relatively new to car audio and would not be able to tell the difference between 1% and .1% The two stars for durability is because my friend bought one and two of the channels blew. So he returned it for another, and one of the channels blew again. He ended up getting fed up and going with Alpine. But when I inspected his system before the alpine install, I noticed a shoddy ground connection. I'm guessing that is why he blew the amps. But I have never had a problem with mine. It overheated ONCE last summer, because it was mounted vertically, in direct sunlight, and being played for 90 minutes on high volume. Bottom line: if you install it properly, you will have no problems, and will love this amp. As far as "entry level" amps go, 5 stars!

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Scott

philly, pa

Overall
Durability
Value
Features
Design
Usability

great product

March 6, 2010

I use this amp to power my four infinity speakers and one 300x1 infinity for a single sub and my car is loud and rockin, yet perfectly balanced.

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Jeremiah

Guam

Overall
Durability
Value
Features
Design
Usability

Awesome perfect clarity

December 12, 2009

Awesome amp, perfect clarity, highs, mids, and lows unaffected, undistorted. Pushing infiniti two 9622i and two infiniti 9623i's and does great at it.

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Bruce

Fort Worth,Texas

Overall
Durability
Value
Features
Design
Usability

great product

November 30, 2009

This is a great product and the price was also unbeatable.

0 of 0 found this helpful

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Neal

AZ

Overall
Durability
Value
Features
Design
Usability

So-So

September 13, 2009

it sounds great and powers my speakers awesome! the bad part is that it gets SOOOO hot... it needs really good airflow. it didnt go into protection mode but i was playing my music loud and then it just got quieter all of a sudden.. for the money its nice but look around a bit more.

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CEP

TAMPA FL

Overall
Durability
Value
Features
Design
Usability

GREAT BUY

September 9, 2009

USE AS A 4 CHANNEL (NO SUBS) IT WORKS BEST DOESN'T HEAT UP, ALSO MOUNT WITH SPACERS ON BOTTOM. ONLY THING I FIND A LITTLE CHEAP IS SLIDE SWITCHES NOT VERY "TIGHT" SLOPPY FEEL. USE THE AMP WHAT ITS MADE FOR......YOU WILL NOT BE DISAPPOINTED.

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bobst

Canada

Overall
Durability
Value
Features
Design
Usability

not what i expected

June 3, 2009

this thing over heats even with just speakers hooked to it.i have kappa 6.5 components in rear and front.sound quality is ok not great.very dissapointed.

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Vik

Richmond hill, NY

Overall
Durability
Value
Features
Design
Usability

Is one of the best in the class

February 21, 2009

I have 2 pairs of midrange speakers connected to it and that sounds loud !! with all the clarity, got a ticket for that; the noise was \"unreasonable and too loud\" and i just had it on 56 out of 80 without sub\'s. And it also depends on how much you are willing to spend like you can spend up to $240 on alpine and still the sound will not be good enough and on the other hand you can spend $120 on infinity and the sound will be way better. Guaranteed

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cliff

evansville, WY

Overall
Durability
Value
Features
Design
Usability

infinity 475a

October 9, 2008

This amp is a good amp,for 4 chanel opperation it sounds really good on my infinity component speakers.If you want fullness out of you speakers the power and quality of this amp will make all the difference in you sound system.

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Joe

Trail, OR

Overall
Durability
Value
Features
Design
Usability

Don't expect too much

August 11, 2008

I bought this Amp about a year ago to install in my 04 F150. It is powering my front components and a 10" RF p3 shallow sub. It is mounted behind the rear seat with 4awg wire. This amp overheats like nobody's business. It NEEDS PLENTY of air flow, which it doesnt get being behind my back seat. I have installed a cooling fan, but It will still go into protection mode after about 30min at moderate volume. I plan on buying a Kicker Class D amp for my sub and using the infinity for just the door speakers. Hopfully it will be capable of that..

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Derik

Mooresville, NC

Overall
Durability
Value
Features
Design
Usability

Loud and Clear.

July 31, 2008

Got this thing hooked up nice to a pair of Component Alpine Type Xref's and a pair of Kenwood Execelon 172's. great clarity...hence Infinity. i only have it turned halfway up and its louder than any of my buddies systems. i can turn my head unit all the way up and its so clear and loud its disgusting. it makes everything sound perfect, and like your at the studio or concert. get it here. okay have fun get one right now cause this item is SICK.

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Douglas

Manchester, NY

Overall
Durability
Value
Features
Design
Usability

not bad

October 12, 2007

this item isnt too bad...hooked it up to 2 kicker 12's holds up [ppretty good on half way..

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joe bl

salt lake, utah

Overall
Durability
Value
Features
Design
Usability

a bit dissapointed...

August 5, 2010

I bought this amp hoping to use it to push to 12's. It is a great amp for mids and highs, but not much else. The description should make this very clear, and it doesn't.

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Accessory Tools and Products

Accessories added

NVX XBG3PK 1/0 Gauge OFC Big 3 Upgrade Kit

Comes with everything you need to upgrade your power and ground wire.

Your Price $79.99

Kicker Big 3 Package 1/0 Gauge Big 3 Upgrade Kit

Get all you need including wire cutters to upgrade your power and ground wire.

Your Price $149.99

Belva BBG3KT CCA 1/0 Gauge Big Three Kit

Features everything needed to upgrade factory power and ground wire.

Your Price $39.99

Universal Remote Level Bass Control

Controls bass level and frequency via RCA/Interconnect connectors on any amp.

Your Price $7.99

Small Universal Remote Level Bass Control

The Scosche RLC is a smaller universal bass remote that connects via RCA inputs.

Your Price $11.99

StreetWires FB8

8 Gauge Firewall Bushing

Your Price $6.95

NVX XDBU4 - Top of the Line!

Distribution Block with Two 1/0 or 4 AWG Inputs and Four 4 or 8 AWG Outputs

Your Price $17.99

Professional Installation for your Car Power Amplifier

Covers labor charges through our professional installer network.

Your Price $89.99

NVX XIV45 4-Channel RCA Audio Interconnect Cable

5 Meters (16.4 ft.) 4-Channel RCA Audio Interconnect Cable with Dual Twisted Pair Hyper-Flex Technology

Your Price $23.99

Kicker K-Series RCA Interconnect Cable

19 ft. of 4-Channel RCA cable with dual twisted-pair conductors, hyper-flex technology, and gold plated contacts for maximum signal transfer!

Your Price $29.95

StreetWires ZN7 RCA Interconnect Cable

16.4 ft. of 4-Channel RCA Cable with hyper twist construction, oxygen free copper, and precision machined tips.

Your Price $59.99

Kicker 4-Channel RCA Audio Interconnect Cable

4 Meters (13 ft.) 4-Channel K-Series RCA Audio Interconnect Cable

Your Price $19.95

NVX XWS1225 12 AWG Speaker Wire

25 ft. of True 12 Gauge 100% Copper EnvyFlex Speaker Cable/Wire

Your Price $39.99

NVX XWS1250 Speaker Wire

50 ft. of True 12 Gauge 100% Copper EnvyFlex Speaker Cable/Wire

Your Price $29.99

NVX XWS1625 16 AWG Speaker Wire

25 ft. of True 16 Gauge 100% Copper EnvyFlex Speaker Cable/Wire

Your Price $13.99

Belva BBSW127 12 AWG Speaker Wire

12 Gauge 7 Meter (23 Ft) Speaker Wire (CCA)

Your Price $14.99

Belva BBSW167 16 AWG Speaker Wire

16 Gauge 7 Meter (23 Ft) Speaker Wire (CCA)

Your Price $12.99

The Install Bay IB-CAP1F

True 1.0 Farad Car Audio Capacitor for up to 1000W Max

Your Price $37.99

e2 ECAP1 by Scosche - Mid-Level 1 Farad

Digital 1.0 Farad Car Audio Capacitor for up to 1000W Max

Your Price $49.99

SMD DD-1 Distortion Detector

Set the gain of an audio amplifier quickly and accurately

Your Price $149.99

Scosche SPL Meter SPL1000F

Handheld boomSTICK measures your SPL range from 60 to 135 dB

Your Price $21.99

AutoSound 2000 CD-102

High Frequency Test CD specifically designed for the set-up and evaluation of sound system imaging and placement.

Your Price $11.99

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Product Summary

Manufacturer

Model Number

475a

UPC

050667034993

Weight

14.00lbs

Internal SKU

475a

Internal Product ID

9712

Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Infinity Reference 475a