In very good condition. Easily switch between monitors, have multiple inputs, input monitoring, multiple outputs, headphones, talkback mic. the works!
The big knob itself occasionally sounds a little scratchy while actively adjusting volume. I just mute it, give it a couple big twists along its full range, and that seems to clear it out for a bit. Likely just needs a cleaning, but it hasn't bothered me enough to do anything about it. Comes with power cable.
From Mackie:
Mackie BIG KNOB STUDIO Monitor Controller & Interface for Studio Recording Apps
Studios of any size can benefit from the professional source/monitor selection and precise level control of the Big Knob Series. Plus, with the addition of high-resolution Onyx™ USB recording and playback, studios get a powerful, hybrid solution that is truly greater than the sum of its parts.
FEATURES
• Professional source and monitor selection
• Choose between 3 sources and 2 monitor pairs
• Classic Big Knob volume control
• Independent trim on all sources and monitor outs
• Mono, mute and dim functions
• Flexible 2x2 USB recording interface
• Two boutique-quality Onyx mic preamps including phantom power for condenser microphones
• High-resolution 192kHz / 24-bit recording and playback
• Cue mix allows controlled blending of direct inputs with other signals for zero-latency recording
• Choice of recording paths provide flexibility for applications like podcasting
• Comprehensive feature set for professional studios
• Flexible source connections including convenient 1/8” input for your smartphone
• Dual headphone outs with independent level control
• Built-in talkback mic for easy communication with artists
• 16-segment high-resolution input source metering
• Sturdy “Built-Like-A-Tank” design
• Compatible with all major DAWs on both Mac and Windows