Mackie Big Knob Studio Monitor Controller/USB Audio Interface Features:
 
Studio monitor controller and USB audio interface
Dual Onyx preamps for recording high-fidelity, low-noise audio
Easily switch between three input sources and two monitor pairs
Trim controls allow you to balance the volume of different pairs of monitors
Talkback for communicating with artists
Headphone outputs for artist monitoring
Stereo aux input for connecting music player for reference tracks
Large volume knob for easy level adjustments
Handy buttons for Mono, Mute, and Dim
 
Tech Specs
 
Input Channels:3 x sources
Output Channels:2 x stereo monitors
Analog Inputs:2 x 1/4" TRS (line), 2 x XLR-1/4" combo (mic), 1 x 1/8" (aux in)
Analog Outputs:4 x 1/4" (monitors A/B), 2 x 1/4" (2-track)
Headphones:2 x 1/4"
USB:1 x Type B
Computer Connectivity:USB
Talkback:Built-in
A/D Resolution:Up to 24-bit/192kHz
Software:Traktion
Compatibility:Mac, Windows
Form Factor:Desktop
Power Supply:18V DC power supply (included)