Mackie MR524 5” Powered Studio Monitor
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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. 
Excruciatingly simple 2x2 monitor controller
Choose between two sources and two monitor pairs
Classic Big Knob volume control
Professional mono, mute and dim functions
Pristine audio quality
Passive audio path with no power supply needed
Sturdy “Built-Like-A-Tank” design
Now with three products in the Big Knob lineup, studios of any size will benefit from the professional source/monitor selection and precise level control that made the original such a popular choice. 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. 
Sure, we all know the Mackie Big Knob is the go-to monitor controller for studios the world over. But, now that we've added in the high-resolution goodness of an Onyx recording and playback solution, Big Knob truly becomes the nerve center for your studio. Or, if you are looking for excruciatingly simple volume control/monitor switching, the Big Knob Passive delivers at an amazing price.
PRO SOURCE AND MONITOR SELECTION
The Mackie Big Knob has proven itself for more than a decade as the go-to monitor controlling solution for project and professional studios. The all-new Big Knob family takes the best of this classic workflow, delivering the right solution for the modern studio. 
PREMIUM ONYX RECORDING/PLAYBACK
Both the Big Knob Studio and Big Knob Studio+ offer high-resolution USB interfacing at resolutions up to 192 kHz, featuring dual Onyx mic preamps, delivering an ultra-wide 60 dB of gain range and award-winning sound quality. 
FLEXIBLE INTEGRATION
The expanded Big Knob lineup offers models with unique feature sets and I/O to suit a huge range of applications. Features like dual headphone outs, a dedicated amp-driven studio out, a true cue mix and more ensure Big Knob will fit right into your studio or workspace.