Mackie Big Knob Desktop Studio Monitor System Tabletop level control/monitor switcher/source selector & talkback boxBig, convenient volume knob for precise level adjustmentsSwitches among 3 sets of studio monitorsBuilt-in talkback microphone eases communication with musiciansMonitor 4 independent stereo inputs including one for your DAW MixDual headphone outputs with independent volume controls and headphone mix busPhono preamp for direct turntable connectionHigh-end studio sound quality and robust constructionPerfect for computer-based stu