The ISV-500 A is a newly developed, high-performance induction loop amplifier designed for professional audio transmission to hearing aids via T-coil. Ideal for covering areas up to 1,000 m², it ensures barrier-free access to audio content in acoustically challenging environments such as churches, cinemas, theaters, retail counters, bank service desks, interpreter booths, and drive-in/drive-through setups.

Equipped with a digital automatic audio compressor, a loop detector for impedance measurement and power adjustment, and a 2-point LF/HF equalizer, the ISV-500 A guarantees excellent signal-to-noise ratio and speech intelligibility. Its MLC frequency regulation automatically corrects frequency-related deviations, ensuring consistent performance.

All control elements are recessed to prevent accidental misuse, and the unit includes extensive protection features against short circuits, overheating, idle operation, and overload – making it ideal for long-term use in demanding installations.

Technical details:

• Model: ISV-500 A
• Product type: Automatic induction loop amplifier
• Coverage area: up to 1,000 m² (depending on loop configuration)
• Loop impedance: auto-detected and adjusted
• Compressor: Digital automatic audio compressor
• Equalizer: 2-point LF/HF EQ (±12 dB)
• Frequency correction: MLC regulation
• Audio inputs:
• MIC 1, MIC 2 / LINE (balanced XLR)
• LINE In (unbalanced 6.3 mm jack)
• INSERT
• Phantom power: Switchable (e.g., 12 V DC)
• Protection features:
• Short circuit
• Overheating
• No-load
• Overload
• Soft-start
• Operation: All controls recessed in front panel
• Power supply: 230 V AC, 50/60 Hz
• Use cases:
• Churches, theaters, cinemas
• Retail and service counters
• Interpreter booths, drive-in/drive-through systems

Included items:

• ISV-500 A loop amplifier
• Power cable
• User manual

Special features:

• Automatic loop impedance adjustment via loop detector
• Digital compressor for stable signal levels
• Covers up to 1,000 m² – ideal for large installations
• Exceptional speech clarity in difficult acoustic conditions
• Full protection circuitry for reliable long-term operation