The ISV-300 A is a professional induction loop amplifier designed for medium-sized areas up to approximately 450 m². Developed for high-performance hearing assistance systems, it ensures reliable audio signal transmission directly to hearing aids equipped with T-coils, significantly improving speech intelligibility in acoustically challenging environments.

Typical applications include churches, theaters, cinemas, retail counters, bank desks, interpreter booths, and drive-in/drive-through installations. Unlike traditional sound reinforcement, the ISV-300 A delivers a clear audio signal directly to the hearing aid without background noise or echo interference.

It features automatic compressor/limiter functionality, a powerful MLC frequency correction circuit, and a 2-point EQ for LF/HF adjustment. All controls are recessed for protection against tampering or accidental changes. Multiple integrated safety features guard against short circuits, overheating, idle states, and overload — making it suitable for continuous operation.

Technical details:

• Model: ISV-300 A
• Product type: Induction loop amplifier
• Coverage area: up to approx. 450 m² (depending on loop design)
• Loop impedance: 0.5 – 3.0 Ω
• AMP-LOOP output power: max. 135 W
• RMS current (@ 1 kHz): 4.5 A
• Frequency response:
• Amplifier: 20 Hz – 20,000 Hz
• Loop: 80 Hz – 7,500 Hz (–1.5 dB)
• THD: better than 0.25%
• Compressor/Limiter: automatic (0 – 18 dB)
• Audio inputs:
• MIC 1
• MIC 2 / LINE (balanced XLR)
• INSERT
• LINE In (unbalanced 6.3 mm jack)
• Audio sensitivity: MIC –50 dB, LINE –10 dB
• Phantom power: switchable, 12 V DC
• EQ: LF/HF ±12 dB each
• Frequency correction (LOOP OUT): MLC control
• Temperature monitoring:
• Shutdown at 92 °C
• Restart at 60 °C
• Protection: short-circuit, thermal overload, soft-start
• Power supply: 230 V AC, 50/60 Hz
• Power consumption: 300 VA
• Dimensions (W x H x D): 443 x 44 x 200 mm
• Weight: approx. 4.0 kg

Included items:

• ISV-300 A loop amplifier
• Power cable
• User manual

Special features:

• Ideal for medium-sized venues
• Compliant with EN 60118-4 standard
• Clear speech transmission without acoustic interference
• User-friendly operation with protected controls
• Extensive protection circuitry for safe continuous use