InfoComm 2018: OWI Showcases the MC4-BT Four-Source Audio Mixer With Bluetooth June 11, 2018 | Home / June 11, 2018 rave-video / InfoComm 2018: OWI Showcases the MC4-BT Four-Source Audio Mixer With Bluetooth InfoComm 2018: OWI Showcases the MC4-BT Four-Source Audio Mixer With Bluetooth