... Amplifier, power amplifier, stereo amplifier, pro audio equipment, professional power amplifier, professional audio sound equipment, pro audio sound system, pa audio amplifier ... control of treble and bass.3.2 types of DSP music pre-set modes.4.External jack of active subwoofer, ... function when power on, Low cut of the main channel music(20Hz-200Hz).7.4 sockets of microphone.8.Professional level ...