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Infinity 611A - User Manual

Infinity 611A
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Thank you
for purchasing a Reference Series amplifier.
In order that we may better serve you should you require warranty
service for your new amplifier, please retain your original purchase
receipt and read the enclosed warranty information card.
reference series
311a,611a,
1211a,7521a,
7541a,5761a
instructions

Table of Contents

Other manuals for Infinity 611A

Preview: Service Manual
Service Manual34 pages
Preview: Instruction Manual
Instruction Manual12 pages

Questions and Answers

  • E
    Eric JohnsonSep 9, 2025
    What to do if Infinity 611A has distorted audio and PROTECT LED flashes?
    • J
      Julia GoldenSep 9, 2025
      If your Infinity Amplifier is producing distorted audio and the PROTECT LED is flashing, it indicates a short circuit in the speaker or wire. To resolve this, remove the speaker leads one at a time to find the shorted speaker or wire, and then repair it.
  • J
    james97Sep 12, 2025
    What does it mean if PROTECT LED is on on my Infinity 611A Amplifier?
    • L
      Linda JacksonSep 12, 2025
      If the PROTECT LED is illuminated on your Infinity Amplifier, it means the amplifier is overheated. Ensure that the amplifier's cooling is not blocked at its mounting location. Also, verify that the speaker-system impedance is within the specified limits.
  • I
    iwoodSep 13, 2025
    What to do if my Infinity 611A has no audio and PROTECT and POWER LEDs flash?
    • J
      Julia ButlerSep 13, 2025
      If your Infinity Amplifier has no audio and both the PROTECT and POWER LEDs are flashing, the voltage on the BATT+ connection is less than 9V. Check the vehicle's charging system to resolve this issue.
  • D
    Denise SavageSep 15, 2025
    What to do if my Infinity Amplifier has no audio and PROTECT LED is on?
    • Z
      Zachary SimpsonSep 15, 2025
      If your Infinity Amplifier has no audio and the PROTECT LED is on, it indicates that the voltage on the BATT+ connection is greater than 16V or less than 8.5V. You should check the vehicle charging system.
  • S
    stevensjeremySep 16, 2025
    What to do if my Infinity 611A Amplifier has no audio and PROTECT LED flashes every 4 seconds?
    • K
      Kristine HickmanSep 16, 2025
      If your Infinity Amplifier has no audio and the PROTECT LED flashes every 4 seconds, it indicates DC voltage on the amplifier output. The amplifier may need service; see enclosed warranty card for service information.

Summary

Introduction

Choosing a Location and Mounting the Amplifier

Power Connections

Details on connecting power, ground, and remote terminals for optimal performance.

Wire-Gauge Chart

Specifies recommended wire gauge sizes based on amplifier model and current draw.

Speaker Connections

Guidance on making speaker connections using appropriate wire gauge.

High-Level Input Connections

Information on using speaker-level inputs for head units without RCA outputs.

Applications - 311 a, 611 a and 1211 a

Applications - 7521 a

Applications - 7541 a

Applications - 5761 a

Installation and Setup

Setting the Crossover(s)

Guidance on setting the crossover mode and frequency for different speaker types.

Mode Switch

Explanation of mode switch settings: Flat, HP (High-Pass), and LP (Low-Pass).

Setting Input Sensitivity

Steps to properly set the amplifier's input sensitivity for optimal sound.

Remote Level Control (Optional)

Information on connecting and using an optional remote level control.

Setting the Bass Boost

How to use the bass boost control to enhance low-frequency output.

Aux Output

Details on full-range outputs for connecting additional amplifiers.

Installation and Setup (Cont.)

Setting DBO (311 a, 611 a and 1211 a)

Explanation of the Dynamic Bass Optimizer for enhancing low-frequency reproduction.

Status LEDs

Description of amplifier status indicators: Clip, Power, and Protection.

Troubleshooting

Common problems and their solutions, including no audio and distorted audio.

Specifications

Infinity 611A Specifications

General IconGeneral
Signal to Noise Ratio>100dB
Frequency Response10Hz
Crossover Frequency50Hz - 250Hz
Bass Boost0dB
Signal-to-Noise Ratio>100dB
Input Sensitivity200mV

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