Professional 8A RMS hearing loop amplifier with up to 650m² coverage, compressor/limiter, VOX emergency input, and AS60118.4-2007 design compliance
The Redback A4212 280VA Hearing Induction Loop Amplifier is a professional assistive listening solution designed to improve speech clarity and audio accessibility for people using compatible hearing aids.
Ideal for public spaces where background noise can make conventional sound systems difficult to hear clearly, the A4212 transmits audio through an installed induction loop directly to compatible hearing aids and listening devices.
Delivering 8A RMS / 11A peak drive current and supporting coverage areas of up to approximately 650m², the amplifier is suited to larger venues including places of worship, community halls, museums, meeting spaces, and public facilities.
Engineered to meet AS60118.4-2007, the A4212 incorporates tailored frequency response and a fast-attack 2:1 compressor to improve speech intelligibility. Dedicated emergency system connectivity with adjustable VOX muting allows integration with venue evacuation systems.
Key Features
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Up to 650m² Coverage
Designed for large-area hearing induction loop installations
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8A RMS / 11A Peak Drive Current
Powerful output for demanding commercial loop systems
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Designed to Meet AS60118.4-2007
Engineered for professional hearing loop applications
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Integrated Compressor/Limiter
2:1 compression with fast attack helps improve speech intelligibility
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Balanced Microphone & Line Inputs
Professional XLR connectivity for integration with venue audio systems
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Stereo RCA Auxiliary Input
Convenient connection for additional audio sources
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Emergency System Integration
EWIS input with VOX muting for emergency evacuation announcements
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Adjustable VOX Sensitivity
Allows the emergency input switching response to be tailored to the installation
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Short-Circuit Protection
Designed for reliable operation in demanding commercial installations
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19" Rack Mount Compatible
Can be rack mounted using optional Redback A4376 rack ears
Applications
Perfect for:
- Places of worship
- Community halls
- Museums and galleries
- Meeting and conference rooms
- Public buildings
- Reception and waiting areas
- Education facilities
- Commercial accessibility systems
- Assistive listening installations
Specifications
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Brand: Redback
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Model: A4212
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Type: Hearing Induction Loop Amplifier
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Rated Power: 280VA
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Coverage: Up to approximately 650m²*
Output
- Drive Current: 8A RMS
- Peak Current: 11A
- Preferred Loop Impedance: 0.2Ω–1.7Ω
- Loop Connection: Pluggable terminals
Audio Performance
- Frequency Response: 100Hz–5kHz @ -2dB
- Extended Response: 80Hz–6kHz @ -3dB target
- THD: <0.25% @ 50% drive
- Compressor: 2:1, fast attack
Inputs
- 3-Pin XLR microphone/line input
- Stereo RCA auxiliary input
- RCA EWIS/emergency input
- Adjustable VOX sensitivity
Power & Physical
- Power Supply: 240V AC
- Dimensions: 432mm (W) × 380mm (D) × 88mm (H)
- Weight: 7.4kg
- Rack Mounting: Compatible with optional A4376 rack ears
*Actual coverage can vary depending on building construction, steel reinforcement, electrical wiring, and other environmental factors.
Why Choose the Redback A4212 Hearing Loop Amplifier?
The Redback A4212 combines high-current loop drive, large-area coverage, speech-optimised compression, and emergency system integration in a professional solution designed for accessible public and commercial audio installations.
