Part of the BLOX series, this compact adaptor converts a 1/4" unbalanced line level signal to balanced XLR.
These are great for converting unbalanced to balanced signals for long cable runs. I hide these behind flat TVs for running back to amplifiers. I have also found that they can easily be modified with different connectors - takes a little creativity and a soldering iron.
MCM is a great company. Very fast service and shipping of Raspberry Pi. Will tell all my friends to buy from MCM