We are manufacturer, professional power amplifier 1, 150W*2 2, 20HZ-20KHZ 3, Echo. 4, As for KTV ... rooms, more nice from its.Features: Output power: 150W*2 Frequency response: sound: 20HZ--20KHZ Turning mode: Bass: 100HZ ... stereo mixer , as by the center equipments control it; 2.There be front stereo mixer design, as for PRE, ... old songs, and MIC Volume systems. Stereo Digital karaoke power Amplifier