... can be using on meeting conference. Though this series have low power,but it have complite protection,such as ... -voltage,over-temperature,overload,DC and so on.so the series have 2 defferent uses. SPECIFICATIONS:MODELCQ-100CQ-150CQ-2008ΩStereo ... .)20KΩ/10KΩProtectionOverheat,short ciruits,DC,limit and softstart,Output Relay -Zero CurrentSwitch,Intellectual Clip LimiterCrosstalk70dB70dB70dB