Infinity Reference 611a

Mono subwoofer amplifier
456 watts RMS x 1

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Item# 108R611A

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Infinity Reference 1300a
$199.99

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Our take on the Infinity Reference 611a

by Ken Nail

Boasting impressive power ratings and controls for fine-tuning your sound, Infinity Reference amplifiers are an ideal way to send your music to new sonic heights.

The Reference 611a mono subwoofer amplifier boasts a high-efficiency design that ensures steady power delivery. Delivering 456 watts of power to a 4-ohm sub, or 657 watts to a pair of subs, the 611a is powerful enough to satisfy your inner bass head. And every Infinity Reference amplifier is certified to deliver power as advertised.

Variable frequency filters let you contour the output to suit the needs of your speakers. Infinity's Dynamic Bass Optimization (DBO) circuit provides variable "Q" slopes, adjustable bass controls that allow you to tune your sub to its enclosure for more efficient output and cleaner low-end kick.

If you have multiple amps in your system you'll appreciate how the preamp outputs simplify hooking up additional amps.

Highlights:

mono subwoofer car amplifier
456 watts RMS x 1 at 4 ohms (657 watts RMS x 1 at 2 ohms)
variable low-pass filter (32-320 Hz @ 12 dB/octave)
Dynamic Bass Optimization (DBO) circuit (0-12 dB at 20-80 Hz)
Class D design
CEA-2006 compliant
preamp inputs and outputs
fuse rating: 30A x 2
4-gauge power and ground leads recommended — wiring and hardware not included with amplifier
15-7/8"W x 2-11/16"H x 12-1/8"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...	456 x 1
Peak Power Output (Watts x Channels) Loading...	---
Power at 2 Ohms (Watts x Channels) Loading...	657 x 1
Bridged Power (Watts x Channels) Loading...	N/A
Minimum Impedance Bridged Loading...	N/A
Minimum Impedance Unbridged Loading...	2
Best Frequency Response Loading...	17-302 Hz
THD at Rated RMS Power Loading...	1%
Signal to Noise Ratio Loading...	70 dB
Input Voltage Loading...	14.4v
Features
Amplifier Class Loading...	D
Low-Pass Crossover Frequency Loading...	32-320 Hz
Low-Pass Slope (dB/octave) Loading...	12dB
High-Pass Crossover Frequency Loading...	N/A
High-Pass Slope (dB/octave) Loading...	N/A
Bass Boost Loading...	DBO level up to 12dB
Bass Boost Frequency Loading...	DBO freq 20-80 Hz
Fan Cooled Loading...	No
Fuse Rating Loading...	30 x 2
Speaker Level Inputs Loading...	No
Preamp Outputs Loading...	1 pair
Width (inches) Loading...	15-7/8
Height (inches) Loading...	2-11/16
Depth (inches) Loading...	12-1/8
Parts Warranty Loading...	1 Year
Labor Warranty Loading...	1 Year

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What's in the box?

Download owner's manual

Mono amplifier with two 30A fuses installed
2 Spare 30A fuses
4 Self-tapping screws (length=1")
Instructions
Amplifier Quick-Start Guide
Warranty/Product Registration card
Infinity window decal

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, Outputs, and Controls

Features

Class D Design: The Infinity Reference 611a is equipped with a high-frequency Class D switching power supply, which is more efficient than traditional class AB power supplies, and draws less current from your vehicle's charging system.

CEA-2006 Compliance: The specifications given by Infinity for the Reference Series 611a amplifier comply with the new CEA-2006 Amplifier Power Standard from the CEA (Consumer Electronics Association). All manufacturers who comply with the standard can display the CEA-2006 logo on their product.

Protection Circuitry: The amp features 4-way protection, and will shut itself down in the following cases:

DC Output: DC voltage is detected on the amplifier output
Temperature: Amplifier is overheated
Over/Under Voltage: Voltage at the +12V (Battery) terminal is less than 8.5V or more than 16V
Short Circuit: Short circuit in speaker or speaker wire

Status LEDs: Three LEDs on top of the amplifier provide the status of the amplifier. The "Clip" LED indicates the amplifier is being overdriven, and the speakers may be in danger. The "Power" LED indicates the amplifier is on. The "Protection" LED flashes or glows to indicate the amplifier has entered the protection mode because of a malfunction.

Dynamic Bass Optimization (DBO): The Dynamic Bass Optimizer (DBO) is used to enhance low frequency reproduction in your vehicle. Conventional bass-boost circuits only increase bass at a fixed frequency, and cause the amp to consume considerable power. The DBO allows you to adjust the frequency (20Hz - 80Hz), as well as the boost level (up to 12dB), allowing you to fine-tune the bass in your system to optimize performance. The frequency control is a high-pass filter which can be used as a subsonic filter.

Low Pass Filter: The 611a has a variable 12dB per octave, 32-320Hz low pass filter.

Optional Remote Level Control: The amp has an RJ-11 jack for use with the optional 100rc remote level control module (item # 108RC100). This will allow the subwoofer level to be adjusted from the listening position.

Inputs, Outputs, and Controls

Left Side of Amp:

Preamp Output: 1 pair of gold-plated RCA jacks (amp provides a non-filtered signal for daisy-chaining additional amplifiers)
Preamp Input: 1 pair of gold-plated RCA jacks
Input Level: Rotary control to match the level of the preamp input signal
LP Freq: Rotary control to set the cutoff frequency of the Low Pass Filter
DBO:
- HP Freq: Rotary control to set the cutoff frequency of the High Pass Filter
- Boost: Rotary control to set the level of the boost
Remote Level Control: RJ-11 jack for use with the optional 100rc remote level control

Right Side of Amp:

Speaker Output: 4 Set screw terminals for connecting speaker wires; handles up to 8 gauge (16 gauge minimum recommended)
- Note: There are two sets of terminals to make it easier to connect multiple subwoofers. The terminals are connected internally in parallel.
Fuses: 2 Slots for 30A fuses (installed)
Power:
- +12V: Set screw terminal for power wire from battery; handles up to 4 gauge wire (6 gauge minimum recommended)
- Remote: Set screw terminal for remote turn-on lead; handles up to 8 gauge wire (18 gauge minimum recommended)
- Ground: Set screw terminal for ground; handles up to 4 gauge wire (6 gauge minimum recommended)

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5 out of 5

Knockin pictures off the walls!!!!

Written By Teddy-P, Burlington, wi on Monday, April 18, 2011

I've had nothing but infinity systems and i will never switch it up. Right now im running 4 12'' infinity reference subs to this reference series 611a amp n i can't even believe how much power its pushin to these subs. Me n my buddies bet to see how maNY CAR ALARMS i can set off. i recently jus bought another 12 in reference sub wit the infinity reference series 7520a and i can't imajine what thats going to sound like now.. i'll let u know n 2 weeks when my box is built. Thanks for making my moms pictures rattle off her walls!!!!! Lol