2 x 10A Dual Channel Loop Amplifier

The Opus Two-Channel Class D Induction Loop Amplifier LD3.2 provides assisted listening for large spaces, combining two amplifier channels with an integrated phase-shift module. Designed for permanent installations, it delivers audio to compatible telecoil-equipped hearing aids in applications such as auditoriums, conference venues, lecture theatres and places of worship.

Opus specifies indicative single-loop coverage of up to 2000 m². Actual coverage depends on room geometry, listening height, surrounding metal and the chosen loop configuration. A SmartLoop design study is recommended to determine the appropriate cable layout and assess performance before installation.

For multi-loop installations, the integrated module provides a 90° phase shift between the master and slave loops. With a suitable layout, this arrangement can help improve coverage uniformity and control magnetic field spill beyond the intended listening area. These benefits depend on system design and should be verified during commissioning.

The amplifier delivers 2 × 10A RMS at 1kHz, with peak output current of 2 × 15A, and supports loop impedances from 0.5 to 3Ω. Two switchable line or microphone inputs offer flexible source connections, while a priority 100V input supports integration with a suitable public address system. A 12V / 2mA phantom supply is available for compatible microphones.

Compression and automatic gain control help manage variations in audio level. Adjustable metal loss correction supports commissioning where nearby metal affects loop performance.

Open-loop monitoring and thermal protection support reliable operation. Front-panel indicators provide local status information, while an NO/NC fault relay allows faults to be reported to an external monitoring system.

The LD3.2 incorporates a 115/230V AC, 50/60Hz power supply within an enclosure measuring 42 × 200 × 215 mm. It weighs 1.56kg and is specified for operation between 0°C and 45°C.