Opus Technologies HMD1.2 is a two-channel induction loop amplifier for medium-sized rooms. With two loop outputs, the amplifier drives two separate loops and delivers sound to hearing aids set to the T position.
With the standard power supply (24 V / 3 A), the amplifier covers up to 100 m², and up to 150 m² with the optional PS-HMD32V power supply. Auracast™ broadcasting can be added later by connecting an Opus Auracast™ transmitter to the amplifier.
Features
- Two loop outputs, output current 2 × 3.5 Arms
- Two inputs: a line input and an input for line, 70 V, 100 V or high-level audio
- 12 V microphone phantom power, enabled with a DIP switch
- Automatic gain control (AGC) with voice-optimised peak detection
- Adjustable metal loss compensation (MLC)
- Built-in signal generator: pink noise and 1 kHz
- Configuration with DIP switches, input and output level adjustment with potentiometers
- Mounting on a wall or in an equipment cabinet
Package contents
- HMD1.2 amplifier
- External power supply 24 V / 3 A
Technical specifications
- Power supply: 24 V DC, 3 A, external power supply (PS-HMD32V optional)
- Input 1: line input, balanced or unbalanced
- Input 2: line, 70 V, 100 V or high-level audio
- Loop outputs: 2, 2-pin connectors, 3.5 mm pitch
- Output voltage: max. 48 Vpp depending on loop characteristics
- Frequency response: 100 Hz – 6 kHz (−3 dB) depending on loop characteristics
- Auracast™: not integrated; transmitter connection on the PCB or a 4-pin terminal block
- Dimensions: approx. 100 × 150 × 24 mm
Installation
Mount the amplifier on a wall or in an equipment cabinet and connect the audio source to its dedicated input. Choose the loop cable cross-section and layout according to the recommendations of the Opus SmartLoop simulation software, and adjust the amplifier to the IEC standard using the OP-FSM field strength meter, sold separately.