The HLS-DM2 Hearing Loop Module is an advanced Induction Loop driver for use in smaller area local applications. The unit is designed to be integrated into communication systems such as elevators, intercoms, help points and kiosk systems etc. It is backed by Ampetronic’s 5-year warranty and free technical support.
The HLS-DM2 uses efficient class D current drive technology to reduce power consumption and heat output. It is the only small area induction loop driver capable of reliably driving most practical local area loops to meet the IEC60118-4 Standard even where available power or allowable heat is limited, e.g. connecting to equipment that uses PoE or in plastic enclosures.
The transformer isolated balanced input allows simple connection to all intercoms, help points and kiosk systems, making the HLS-DM2 the obvious choice for any quality intercom system.
Whilst the HLS-DM2 draws less than 2.9W @ 12V DC with typical signals, you should still check that any existing supply has enough spare capacity.
The attached video is an example of the audio experience for a hearing aid user at a help point with an integrated HLS-DM2.
Product code:
HLS-DM2
| Power Supply | Standard format: 12V DC | |
|---|---|---|
| Nominal voltage: | 12-24V DC | |
| Min/Max Voltage: | 8-30V DC | |
| Fuse: | 1.5A PTC | |
| Power Consumption: | 2.88W (240mA) continuous pink noise 9.2W (765mA) continuous sine 0.17W (14mA) quiescent Power Save 14.4W (1200mA) max short term peak | |
| Indication: | LED on PCB | |
| Input 1 & 2 | Connector: | Wago 2060 cage clamp for 0.2 – 0.75mm2 solid core or untinned fine stranded wire |
| Line Level | Rated source impedance: | 1.8kΩ differential, |
| Lo Z speaker | Input isolation: | 1500V |
| Rated source EMF (sensitivity): | -16dBu for full output | |
| Overload: | >+22dBu | |
| SnR: | >90dB | |
| Adjustment: | Level control, per channel |
| Loop Output | Compliance voltage: | 4.2VRMS (6Vpk) |
|---|---|---|
| Max output current (sine): | 3ARMS | |
| Rated temperature limited output current (pink): | 1.5ARMS | |
| Rated time for delivery: | 1min | |
| Rated THD: | <1% | |
| Output Impedance: | >9Ω | |
| Current Adjustment: | Full range | |
| Current Indication: | LED indicates 1ARMS | |
| Connector: | Wago 2061 cage clamp for 0.5 – 1.5mm2 solid core or untinned fine stranded wire. | |
| Loop Impedance | 0.3Ω- 1Ω, 1.3Ω reactive at 1.6kHz | |
| Rated Load: | 80uH, 0.5R |
| Freq. Response | 100Hz to 5kHz ±1.5dB relative to 1kHz at low level, measured as loop current with no metal loss correction. | |
|---|---|---|
| Compression | Time constants optimised for speech | |
| (AGC) | Dynamic range: | >36dB |
| Control: | by adjusting input level/gain | |
| Indication: | LED on PCB | |
| Metal Loss | 0dB to 3dB / octave boost | |
| Correction | Adjustable |
| Dimensions | ||
|---|---|---|
| Width | 72mm | |
| Length | 90.5mm | |
| Height | 9mm + mounting clearance | |
| Weight | 44g | |
| Environment | IP00: (PCB for integration) <90% relative humidity, -30 to 75°C | |
| Heat dissipation < 3W maximum, normally less |
The HLS-DM2 can be used to cover a small area using a two turn perimeter loop* at floor level for seated and standing use.
| Room aspect ratio | 1:1 | 2:1 | 3:1 |
|---|---|---|---|
| Maximum area m2 | 56 | 50 | 48 |
* Wire must be 1.5mm2 for optimum audio performance in maximum areas shown – see handbook for maximum area with each wire size. Contact Ampetronic for further advice or if best choice is unclear.
