Infinity Reference 7540a

111W x 4 car amplifier

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Item# 108R7540A

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Infinity Reference 475a
$249.99

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Our take on the Infinity Reference 7540a

by Tim Sprinkle

Whether you're building a component system, powering a pair of full-range speakers, or just pounding away with a subwoofer, there's an Infinity Reference series amp ready to take on the job. Boasting impressive power ratings and fine-tuned controls, these amplifiers are capable of sending your music to new sonic heights.

It's all thanks to high-output MOSFET power supplies — which ensure maximum power delivery to your speakers for efficient operation — and variable filters that let you contour the output to fit your music. And, since every Infinity Reference amplifier is CEA-2006 compliant, you'll know you'll get the power as advertised.

Whatever your power needs, the versatile Infinity Reference 7540a multi-channel amplifier can take care of them. With 111 watts RMS x 4 channels, it can easily drive two sets of full-range or component speakers. Or, you can bridge the channels to stereo mode, and send 278 watts RMS each to a pair of subwoofers or component speaker system.

Highlights:

4-channel car amplifier
111 watts RMS x 4 at 4 ohms (139 watts RMS x 4 at 2 ohms)
278 watts RMS x 2 at 4 ohms in bridged mode (4-ohm stable in bridged mode)
2-, 3-, or 4-channel output
variable high-/low-pass filters (32-320 Hz, 12 dB/octave)
variable Bass EQ (0-12 dB @ 50 Hz)
CEA-2006 compliant
preamp- and speaker-level inputs
preamp outputs
8-gauge power and ground leads recommended — hardware and wiring not included with amplifier
16-3/8"W x 2-11/16"H x 12-1/8"D
fuse rating: 30A x 2
warranty: 1 year
Our 60-day money-back guarantee

Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and specs chart | What’s in the box? | In-depth notes

Features and Specs

Performance
RMS Power Output (Watts x Channels) Loading...	111 x 4
Peak Power Output (Watts x Channels) Loading...	N/A
Power at 2 Ohms (Watts x Channels) Loading...	139 x 4
Bridged Power (Watts x Channels) Loading...	278 x 2
Minimum Impedance Bridged Loading...	4
Minimum Impedance Unbridged Loading...	2
Best Frequency Response Loading...	10-100k Hz
THD at Rated RMS Power Loading...	1%
Signal to Noise Ratio Loading...	81 dB
Input Voltage Loading...	14.4v
Features
Amplifier Class Loading...	AB
Low-Pass Crossover Frequency Loading...	32-320 Hz
Low-Pass Slope (dB/octave) Loading...	12 dB
High-Pass Crossover Frequency Loading...	32-320 Hz
High-Pass Slope (dB/octave) Loading...	12 dB
Bass Boost Loading...	0-12 dB
Bass Boost Frequency Loading...	50 Hz
Fan Cooled Loading...	No
Fuse Rating Loading...	30 x 2
Speaker Level Inputs Loading...	Harness
Preamp Outputs Loading...	1 pair
Width (inches) Loading...	17-9/16
Height (inches) Loading...	2-11/16
Depth (inches) Loading...	12-1/8
Parts Warranty Loading...	1 Year
Labor Warranty Loading...	1 Year

Product Research

What's in the box?

Download owner's manual

4-Channel amplifier with two installed 30A ATC fuses
Two 11" speaker-level input harnesses
Two 30A ATC fuses
4 Self-tapping screws
1 Silica gel packet
One 8" x 2-1/2" Infinity sticker
Instructions
Amplifier Quick Start Guide
Warranty card

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team — they open the box, verify contents, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Features
Inputs and Outputs Notes

Features

Status LEDs: The amplifier has the following status LEDs:

Clip: indicates the amplifier is being overdriven, and your speakers may be in danger. This should blink only on musical peaks, and not be on constantly.
Power: indicates the amplifier is on
Protect: indicates any of the following problems: DC voltage on amplifier output, overheating, under voltage, over voltage, and short circuit in the speakers or wire

Variable Filters: The front and rear channels have separate filters. Each filter can be set for low-pass, high-pass, or full-range operation. In the low-pass and high-pass modes, each filter can be adjusted from 32 to 320 Hz. In each case, the filter has a slope of 12 dB per octave.

Bass Boost: For added low frequency performance, this amplifier has a 0 to 12 dB variable bass boost centered at 50 Hz.

Preamp Outputs: The preamp output jacks provide a convenient source for daisy-chaining an additional amplifier without running an extra set of RCA cables from the front of the vehicle to the amplifier location. These outputs provide a full-range signal.

Inputs and Outputs Notes

Right Side of Amplifier:

+12V (power): 0.357" screw terminal
Remote: 0.357" screw terminal
GRD (ground): 0.357" screw terminal
Speakers: 0.357" screw terminals

Left Side of Amplifier:

Front High Level Input: 4-pin jack for use with supplied speaker-level input harness
Rear High Level Input: 4-pin jack for use with supplied speaker-level input harness

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1-3 of 3 items Sort Results By: Date Reviewed | Rating | Helpfulness

5 out of 5

this amp is great

Written By illwill, fontana, ca on Saturday, November 26, 2011

i got this amp used for 20 dollars. hooked up in my car and was very surprised with the power it has. it pushes 2 10" infinity subs. the bass is perfect. sounds nice and clear, and when you want to bass slap someone you can do that as well. i highly recommend this amp to anybody. great value for the amount of joy you will get from this amp

Pros:

price is exceptional, 4 channels. and of course the "POWER"

Cons:

there is nothing that isn't likeable on this amp

Was this review helpful? Yes | No

5 out of 5

Nice for the price

Written By mailman, Columbia, MD on Monday, January 09, 2006

Very nice. I am running it in 4 channel mode pushing two sets of polk audio speakers. The quality of the sound is beyond reproach. Only problem is that the power/ground block is the plated kind not the block kind so its tough to get a 4 or even 8 gauge wire in there. But overall, very nice.

4 out of 5 people found this helpful

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4 out of 5

Good Deal

Written By Greg, stamford,ct on Saturday, December 31, 2005

I have two 10' Infinity References connected to this amp and after playing around with the settings, THEY BUMP!!

This amp is a good deal for the money. Its half the price of the same amp because its refurbished. I had no problems with mine, and the warranty will cover anything.

The only trouble i had was with the bass boost. It only works in the rear setting so if your driving two subs like me, one of them will hit harder then the other.

16 out of 20 people found this helpful

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1-3 of 3 items

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Things you'll need

Stereo Patch Cables

Patch cables take the music from your stereo to the amplifier. Most amp wiring kits don't include them.

StreetWires Zero Noise 5 Stereo Patch Cables

High-performance cables with superior noise rejection (16.4-foot)

$29.99

In Stock

Extras

Test Discs

Tune your system like a pro with Test CDs.

Autosound 2000 Disc One

Low Frequency Test CD (Disc One)

$19.99

In Stock

Professional Installation

Have your new amplifier put in by a qualified professional in your area.

InstallCard: Amp or Equalizer

Prepaid professional amplifier or EQ installation

$79.99

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For a more in-depth review and enhanced detailed information on the Infinity Reference 7540a, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_108R7540A/Infinity-Reference-7540a.html ).

Crutchfield - North America's electronics authority since 1974

Infinity Reference 7540a

111W x 4 car amplifier

Item# 108R7540A offer details

Review Sumary

Our take on the Infinity Reference 7540a

My system has plenty of power. Who needs an amp?

Highlights:

Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and Specs

Product Research

Our Product Research Team

Product Reviews

this amp is great

Nice for the price

Good Deal

Learn more about All Car Amplifiers

Learn more about All Car Amplifiers

Car Amplifier Shopping Guide

Everything About Subwoofers from A to Z

Video: Car Amplifier Power

Video: Car Amplifier Channels

Video: Car Amplifier Build Quality

Accessories

Things you'll need

Extras

About Crutchfield

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