... KTV rooms. more nice from its. We are manufacturer, professional power amplifier.1, 150W*22, 20HZ-20KHZ3, Echo4, As for KTV rooms ... .05% information: 180mv MIC: 10mv Details: 1, Within ECH+DELAY stereo mixer , as by the center equipments control it; 2, There ... be front stereo mixer design, as for PRE, turning. PRE informationoutput freely. and ...