Passive monitor controller with stepped volume knob with matching resistors for excellent stereo imaging. Pictured here with rack mountable ears which can be easily removed to make it a desktop controller. I also have the original variable potentiometer for continuous volume changes if that's more your thing? This has been gently used and well cared for in a smoke-free home studio!
Read More Here:
https://www.audiotechnology.com/reviews/sm-pro-m-patch-v2