会议麦克风产品GC-90MC参数：
Model No:GC-90M
Element: Back Electret Condenser ;
Polar pattern :Omni-Directional ;
Frequency response:20-20KHz ;
Sensitivity :- 40dB±3dB ;
Output impedance :250Ω±30% ;
Power Supply :48V Phantom
Model No:GC-90C
Element: Back Electret Condenser ;
Polar pattern :Uni-Directional ;
Frequency response:50-16KHz ;
Sensitivity :- 45dB±3dB ;
Output impedance :250Ω±30% ;
Power Supply :48V Phantom
补充说明：
会议麦克风，产品型号：GC-90MC
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