BIG KNOB PASSIVE MONITOR CONTROLLER ・Operational Status It was operating without any particular problems. This passive monitor controller allows for easy volume adjustment and monitor selection. There are small scratches on the knob. It's convenient as you can switch to MUTE and MONO with a single button. - Model: BIG KNOB PASSIVE MONITOR CONTROLLER - Volume Adjustment: Adjustable with the large center knob - Functions: Equipped with MONO, MUTE, and DIM functions - Input/Output Terminals: BAL/UNBAL source input and monitor output - Connection Terminals: Line input (B) Thank you for viewing. DTM MACKIE Mixer Speakers Monitor Controller Interface