... rooms. more nice from its. We are manufacturer, professional power amplifier.1, 150W*22, 20HZ-20KHZ3, Echo4, As for KTV rooms ... the center equipments control it; 2, There be front stereo mixer design, as for PRE, turning. PRE informationoutput freely. and ... working; 6, Sytem wire protection : A, Horn system B, loading system C, Short circuit D, information system 7, Inner limited MIC volume output ...