We are manufacturer, professional power amplifier 1, 150W*2 2, 20HZ-20KHZ 3, Echo. 4, As ... rooms. more nice from its. We are manufacturer, professional power amplifier.1, 150W*22, 20HZ-20KHZ3, Echo4, As for KTV rooms ... , Within ECH+DELAY stereo mixer , as by the center equipments control it; 2, There be front stereo mixer design, as for ...