GB9221 series instruction manual
-1-
emergency broadcast at fire or other accident scenes.In the field of fire broadcast,
GB9221 must be used with the GB9242(Fire Broadcasting Host)to complete the fire
broadcast. Background music broadcast can be directly played by external input source
signals (such as CD/MP3 player, tuner, etc.) when there’s no accident event.
2） The display of GB9221 series fire alarm broadcast amplifiers is built-in LED
indicator lights.These built-in LED indicator lights can indicate various operating
conditions and fault conditions.All the functions can be set up with light touch
buttons.
3 ） GB9221 series fire alarm broadcast amplifiers only contain the power
amplification section of the GB9242(Fire Broadcasting Host). The output power could
be 150W/300W/500W.
4） GB9221 series fire alarm broadcast amplifiers assemble high quality power
transformers internally.The static power consumption is low and the overload
capability is high.GB9221 series have overload and over-temperature protection
circuit, buzzer alarm when a fault occurs.
2 Main Specifications
1） Power supply：
10%,-15%,50Hz)
DC：see table1-1
2） Line input sensitivity：
300mV ～775mV（line1、line2）
3） Line output level：
500mV ± 100mV
4） Effective frequency range
for distortion limitation： 80Hz ～ 8kHz
5） Total harmonic distortion：< 5%
6） SNR：
> 70dB
7） Monitor power：
3W
8） Fixed output voltage：
120V（fixed voltage mode）
9) Rated output power：
150W/300W/500W
10) Working environment：
a）temperature
0℃-40℃
b）humidity
<92％
11) 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)
