We are manufacturer, professional power amplifier 1, 150W*2 2, 20HZ-20KHZ 3, Echo ... rooms. more nice from its. We are manufacturer, professional power amplifier.1, 150W*22, 20HZ-20KHZ3, Echo4, As for ... /hign: 10KHZ+/-10DB S/n ratio: 60db T.H.D: 0.05% information: 180mv MIC: 10mv Details: 1 ... A, Horn system B, loading system C, Short circuit D, information system 7, Inner limited MIC volume output system; ...