Mackie BIG KNOB PASSIVE benefits from a proven, bestselling design to deliver professional-level control, plus source and monitor selection for studios of any size. The passive audio path ensures pristine sonic integrity is maintained throughout your signal chain. More than just a level control solution, BIG KNOB PASSIVE features the ability to choose between two sources and two monitor pairs. Ideal for simple level control at a home or project studio or for integration in a large studio or group of editing suites, BIG KNOB PASSIVE is the “built-like-a-tank,” affordable monitoring control solution. Mackie Big Knob Passive benefits from a proven, bestselling design to deliver professional-level control, plus source and monitor selection for studios of any size.