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 ... power: 150W*2 Frequency response: sound: 20HZ--20KHZ Turning mode: Bass: 100HZ+/-10DB Treble/hign: 10KHZ+/-10DB S/n ratio: 60db ...