Power amplifier GB9221

audiosoundhigh-power

Product Overview
GB9221 series fire alarm broadcast amplifiers are power-amplification modules designed to be used with a Fire Broadcasting Host (GB9242) to deliver emergency voice announcements at fire or other accident scenes. When no emergency is active, external audio sources (CD/MP3 player, tuner, etc.) can be routed to the amplifier for background music playback.

Key Features

• Front-panel LED indicators for operating and fault status; functions configured via light-touch buttons.
• Power amplification module only — available rated output: 150W / 300W / 500W.
• High-quality internal power transformer for low idle consumption and strong overload capability.
• Built-in overload and over-temperature protection circuits with buzzer alarm on fault.

Applications

• Emergency voice broadcasting at fire or accident scenes when used together with a Fire Broadcasting Host (GB9242).

Technical specifications

• Power supply: AC220V (+10%,-15%, 50Hz)
• Line input sensitivity: 300mV ～ 775mV (line1, line2)
• Line output level: 500mV ± 100mV
• Effective frequency range for distortion limitation: 80Hz ～ 8kHz
• Total harmonic distortion: < 5%
• Signal-to-noise ratio (SNR): > 70dB
• Monitor power: 3W
• Fixed output voltage: 120V (fixed voltage mode)
• Rated output power: 150W / 300W / 500W
• Working environment: temperature 0°C - 40°C; humidity <92%
• Insulation resistance: a) backup power input & the chassis >20MΩ (DC500V); b) AC input voltage & the chassis >50MΩ (DC500V); c) fixed output voltage & the chassis >50MΩ (DC500V)
• Electrical strength: no breakdown between AC input & the chassis; leakage current <5mA (AC2000V)