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Infinity Reference 611a

Mono subwoofer amplifier
456 watts RMS x 1

Item # 108R611A

Boasting impressive power ratings and controls for fine-tuning your sound, Infinity Reference amplifiers are an...

Find what Fits your vehicle

Boasting impressive power ratings and controls for fine-tuning your sound, Infinity Reference amplifiers are an...

Discontinued item

Item # 108R611A

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Since 1974

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About the Infinity Reference 611a

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.

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.

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Product 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
  • MFR # REFERENCE 611A

What's in the box:

  • 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

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More details on the Infinity Reference 611a

Mark G.

Product Research

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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