The DB14b is a special purpose direct box for applications where a stereo source signal can be separated, and individual volume controls used for each track. It provides a summed XLR output four uses such as an AV presentation from a laptop computer, or a rehearsing choir to a music track. Hum elimination is also included with the ground lift switch. It has stereo RCA and 1/8\\\" inputs, 2 volume controls, RCA and XLR outputs, and uses no power.Features: Splits Stereo RCA and stereo 1/8" (3.5mm) signals Individual Right and Left level controls Transformer balanced XLR mono output Hum elimination/ground lift switch Right/Left In: RCA and 1/8" input jacks. For connection to alaptop computer, CD player, DVD player, etc.R/L Out: RCA jacks for sending the input signals out to a linelevel amplifi cation device.Low Z Out: Male XLR jack for sending out a mix of both Aand B signals.Right/Left Volume: Controls the level of each input signalindependently.GND-LIFT: Ground/Lift switch for disconnecting the groundof the XLR jack from the ground of the DB14b.