The HLD9 large area hearing loop driver is making its first ISE appearance.
Contacta makes its first use of Class D technology in its HLD9, meaning both the power supply and output amplifier have greater than 90% efficiency.
The company claims this means its drivers do not require the fan cooling or large heatsinks that many other drivers do, and says they are quieter, lighter and require less maintenance.
The HLD9 uses a fully discrete high performance switching converter output stage. Its distinguishing features are flat frequency response irrespective of load impedance, nearly frequency-independent distortion behaviour, and very low radiated and conducted EMI.
Control is based on a phase-shift controlled self-oscillating loop taking feedback only at the converter output.
The company claims its ‘intelligent’ driver thinks for itself. Using a dedicated signal processor to control system functions allows for remote control adjustment and no need for complicated calibration procedures to compensate for loop characteristics.
With its DSP core, the driver is able to measure the characteristics of the loop connected to it and make necessary adjustments in order to achieve a flat output frequency response. The drivers can also sense when to shut themselves down so there is no risk of overheating.
The driver is designed for very low frequency independent total harmonic distortion. Contacta claims this results in lifelike music reproduction with total reliability.
After an extensive testing period, the HLD9 has been installed at a number of Contacta’s customer sites, powering large loops at a range of venues including corporate boardrooms and theatres.