The Mackie Big Knob has been the go-to monitor controller for studios the world over for well over a decade. And with the Big Knob Passive, you get the purest audio path possible with zero active electronics in the signal path plus incredibly simple and easy source and monitor switching. A trio of buttons for Mute, Mono and Dim provide essential, quick control. Best of all, the Mackie Big Knob Passive is built-like-a-tank, so studios, streamers and engineers can count on solid performance for years to come. If you are putting together a studio of any size from bedroom to commercial facility, Big Knob should be at the top of your shopping list.