What it is

KnobSwitch is a minimal entertainment center controller. One big-ass knob for volume control and one selector switch for input source.

What it does

Gives you instant, simple selection of your input source and volume control. Communicates to your equipment via BLE and RS-232.

I have a Marantz SR8500 SR5010 with a serial port. Yes, you could use IR but I want this thing to be reliable, i.e. closing the control loop with feedback from the equipment.

The Marantz receiver is lovely but scrolling through all the inputs using the big knob on the front is maddening and slow. Using the remote is even more maddening because it has a thousand tiny buttons I dont’ have one anymore, and I recently installed the receiver into a rack so it’s no longer in the line of sight.

I’d like to have one place to control both the audio volume and the overall input source. This requires fusion of audio and video source switching.

What it’s made of




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