We are manufacturer, professional power amplifier 1, 100W 150W 200W 280W 380W 500W 680W 2, ... Has passed ISO,CCC,CE, Certifica We are manufacturer, professional power amplifier.1.100W 150W 200W 280W 380W 500W 680W2.Has ... volume, treble and bass volume can be regulated independently5. Has 6 individual zones, each zone can control it own volume separately ...