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, 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, Specifications:, Max Input Level: +20 dB, Max Output Level: +20dB RCA, 0 dB XLR, Frequency Response: (Low Z) 50 Hz to 16 kHz, SKU: TBALL11332