Combining comprehensive control over your studio monitors with a high-resolution USB audio interface, the Mackie Big Knob Studio+ delivers big value for project studios. Dedicated buttons allow you to switch between four input sources and three pairs of speakers, with trim controls on the speaker outputs to balance volume between sets of monitors. And with two Onyx mic preamps onboard, two headphone outputs, and Talkback functionality, the Mackie Big Knob Studio+ monitor controller and interface is a complete monitoring and recording solution.