LEVEL 1 - controls overall volume level of Input 1
LEVEL 2 - controls overall volume level of Input 2
LEVEL 3 - controls overall volume level of Input 3
PHASE 1 toggle switch - determines the Input 1 signal phase. (in phase / out of phase)
Power Supply : Only use a regulated 9V-18V DC adapter with a center-negative plug, 2,1mm Barrel Connector. "Daisy Chain", unregulated power supplies and/or higher voltages may result in suboptimal noise performance and even damage your unit. No Battery.