Rolls MB15 Two Way Stereo Convertor

The MB15 ProMatch converts consumer level stereo RCA signals to
balanced XLR professional line level, and back. One side of the unit,
labeled 1, has two XLR inputs and stereo RCA outputs. The other side
labeled 2, has stereo RCA inputs and two XLR outputs. Each side has
stereo level controls, and an LED indicates that power is applied to
the unit. An additional benefit of the MB15 is that it will act as a
balanced XLR line level control. By adding a stereo pair jumper between
the four RCA jacks (connecting ins to outs), the two Level controls may
be inserted into any balanced XLR line.