... 1,Noise-free AMP 2,Multiple wise protection 3,Excellent timbre 4,Two dual-speed fans switch Professional Power AmplifierDetails: ... client's requirement PRODUCT DESCRIPTION:1,This amplifier is noise-free When without output connect, this amplifier have no noise ... mono. It can connect the speaker speedy by the professional SPEAKON.7,The unit has consummate working status indications including ...