MM-Audio Z4 4000W DSP Karaoke Microphone Mixing Amplifier – Black. Condition: New, Open Box — all included items shown in photos and untested unless otherwise noted; distressed packaging; labels removed from box exterior. 20Hz – 20kHz Frequency Response. 3x HDMI in, 1x HDMI eARC. Non-Missouri residents will need to pay IN PERSON (credit/debit cards only) […]