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Redback® Hearing Loop Ampliers
Overview
1.0 OVERVIEW
1.1 INTRODUCTION
Induction Loop ampliers, also known as T-loop or Hearing Loop ampliers, are installed to greatly enhance the listening
experience of people using hearing aids. The hearing loop, as its name suggests, is basically a loop of wire which
surrounds a designated area to transmit audio to a hearing aid. An audio source is fed into the Amplier, and the output
of the amplier then sends a high current signal into the loop, which generates a magnetic eld. The magnetic eld is
then picked up by the Telecoil inside a hearing aid.
Hearing Loops are commonly installed in public areas which are generally noisy, making it difcult for hearing impaired
users to hear clearly. The A 4210 and A 4212 amplier models have been engineered to meet AS60118.4-2007 and in-
clude a compressor/limiter circuit with tailored frequency response ensuring excellent speech intelligibility. They will
operate into loads of less than 2 ohms and are short circuit proof. Great for places of worship, community halls, museums
public places, etc.
The A 4210 80VA model delivers 3.5A RMS, 5 Amps peak and the A 4212 280VA model delivers 8A RMS, 11 Amps peak
into a typical Loop Resistance of 0.2Ω to 1.7Ω (max 2Ω).
The A 4210 is suitable for areas of approximately 180-200m2 subject to metal loss and the A 4212 is suitable for areas of
approximately 400-650m2 subject to metal loss.
Note that coverage may vary from site to site depending on outside inuences such as steel reinforcement, high current
electrical wiring etc.
Inputs are provided for balanced mic and line, auxiliary and an EWIS input with VOX muting for interfacing into venue
emergency evacuation systems.
1.2 FEATURES
• Designed to meet AS60118.4-2007
• Coverage up to 180-200m2 for the A 4210 and 400-650m2 for the A 4212
• XLR line & mic inputs
• Aux input via stereo RCA
• EWIS signal connection (RCA)
• Short circuit proof
• Compressor for added speech intelligibility
• Adjustable VOX sensitivity
• Compatible with single loop designs
• 240V AC operation
• 19” Rack Mount (with optional A 4376 rack ears)
1.3 WHAT’S IN THE BOX
A 4210/12 Induction Loop Amplier
240V AC IEC C13 Appliance Mains Lead 10A 3 Pin Black
Instruction Booklet
Hearing Induction Loop Installed Label