Infinity Reference 5761a

6-channel car amplifier
56 watts RMS x 4 + 107 watts RMS x 2

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Item# 108R5761A

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Infinity Reference 1600a
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Our take on the Infinity Reference 5761a

by Ken Nail

Infinity Reference amplifiers boast impressive power ratings and fine-tuned controls — ideal for sending your music to new sonic heights.

When you want an amp that's truly versatile, it's hard to go wrong with the 6-channel Infinity Reference 5761a. Its 4-channel section (56 watts RMS per channel) drives all your full-range or component speakers, while two subwoofer channels (107 watts RMS x 2) take care of your low-frequency needs. You can operate this amp in 3-, 5-, or 6-channel mode, so this is one amp that you'll never outgrow.

You can contour the output to suit your speaker setup with the variable high- and low-pass filters. Kick up the bass output with Infinity's Variable Bass EQ when you need a little extra impact. Speaker- and preamp-level inputs ensure this amp integrates smoothly into your system.

Highlights:

6-channel amplifier
56 watts RMS x 4 + 107 watts RMS x 2 at 4 ohms (80 watts RMS x 4 + 148 watts RMS x 2 at 2 ohms)
56 watts RMS x 4 + 287 watts RMS x 1 in 5-channel mode
148 watts RMS x 2 + 287 watts RMS x 1 in bridged mode
variable high-/low-pass filters on front and rear channels, low-pass only on sub channels (32-320 Hz, 12 dB/octave)
variable Bass EQ on sub channels only (0-12 dB @ 50 Hz)
CEA-2006 compliant
4-gauge power and ground leads recommended — wiring and hardware not included with amplifier
preamp- and speaker-level inputs
optional wired level control
fuse rating: 30A x 2
21-1/8"W x 2-11/16"H x 12-3/16"D
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...	56 x 4 107 x 2
Peak Power Output (Watts x Channels) Loading...	N/A
Power at 2 Ohms (Watts x Channels) Loading...	80 x 4
Bridged Power (Watts x Channels) Loading...	148 x 2
Minimum Impedance Bridged Loading...	4
Minimum Impedance Unbridged Loading...	2
Best Frequency Response Loading...	10-57kHz Hz
THD at Rated RMS Power Loading...	1%
Signal to Noise Ratio Loading...	82 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...	No
Width (inches) Loading...	21-1/8
Height (inches) Loading...	2-11/16
Depth (inches) Loading...	12-3/16
Parts Warranty Loading...	1 Year
Labor Warranty Loading...	1 Year

Product Research

What's in the box?

Download owner's manual

6-Channel amplifier with two installed 30 Amp ATC fuses
Two 11" speaker-level input harnesses
Two 30 Extra amp ATC fuses
Four 1" Self-tapping screws
1 Silica gel packet
One 8" x 2-1/2" Infinity sticker
Instructions
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

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 Crossovers: The front, rear, and sub channels have separate crossovers. The front and rear channel filters can be set for low-pass, high-pass, or full-range operation. The sub channel filter is low-pass only and cannot be turned off. Each crossover 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, the sub channels have a 0 to 12 dB variable bass boost centered at 50 Hz.

Sub Channel Input: The sub channels have a mode switch that can be set to one of the following options:

External Input: When sending a dedicated signal to the RCA subwoofer inputs
Internal Input: When using only the the front and rear inputs; this is useful if your receiver does not have dedicated subwoofer outputs

Remote Level Control Compatible: The optional 100rc wired remote level control (item number 108RC100) allows you to adjust the bass level from anywhere in the vehicle.

Inputs and Outputs

Right Side of Amplifier:

+12V (power): 0.334" screw terminal, accepts up to 4 gauge wire
Remote: 0.258" screw terminal, accepts up to 8 gauge wire
GRD (ground): 0.334" screw terminal, accepts up to 4 gauge wire
Speakers: 0.248" screw terminals, accepts up to 8 gauge wire

Left Side of Amplifier:

Line Level Inputs: Three pair of RCA inputs for front, rear, and subwoofer
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
Remote Level Control: RJ-11 jack for use with the optional 100rc wired remote level control

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1-10 of 10 items Sort Results By: Date Reviewed | Rating | Helpfulness

5 out of 5

Brings a Tear to the Eyes

Written By Damon, Chicago, IL on Saturday, February 17, 2007

Wow! I just took my system to the next level with this one addition. I'm running two 6-in. components in the front, two 6-in References in the rear, and one 12-in sub in the trunk with this one amp. The clarity is so crystal clean it's almost transparent, and the power is enough to make your eyes water and contacts fall out. I'd recommend this bad boy to anyone. No deal out there is better.

3 out of 3 people found this helpful