2 x 5A Dual Channel Loop Amplifier

The Opus Two-Channel Class D Induction Loop Amplifier LD1.2 provides assisted listening for medium and large spaces, with two amplifier channels and an integrated phase-shift module. Designed for permanent installations, it delivers audio to compatible telecoil-equipped hearing aids in applications such as lecture theatres, meeting facilities and places of worship.

Opus specifies indicative coverage of up to 600 m² in a single-loop configuration or 300 m² in a multi-loop arrangement. Actual coverage depends on room geometry, listening height and surrounding metal, so a SmartLoop design study is recommended before installation.

For multi-loop systems, the integrated module provides a 90° phase shift between the master and slave loops. With an appropriate cable layout, this arrangement can help improve coverage uniformity and control magnetic field spill outside the intended listening area. Performance depends on the loop design and should be verified during commissioning.

The amplifier delivers 2 × 5A RMS at 1kHz and supports loop impedances from 0.5 to 3Ω. Two switchable line or microphone inputs provide 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 allows installers to compensate for the effects of nearby metal on 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 LD1.2 incorporates a 115/230V AC, 50/60Hz power supply within a compact enclosure measuring 42 × 200 × 215 mm. It weighs 1.56kg and is specified for operation between 0°C and 45°C.