MPA integrated amplifier series features: 1) 70V and 100V stable power output port and 4 16ohm stable resistance output ports are provided. 2) Separate volume control over each channel and bass and alt adjusting are available. 3) Short circuit output protection is provided. 4) MIC1 priority compared with other input channels. 5) Pre-signal of MPA can be connected with other amps by PRE OUT port while other pre-amps can also be connected with it by AMP IN port. 6) Naturally dissipating heat to decrease the working noise of the equipment 7) Matched with bracket for rack. 8) When AC is in a fault, the equipment will be made to go on running by backup power supplying system.