Jacks in box/RCA combiner. Ever wanted to plug a tape player and CD player into a mixing console, but didn’t have enough channels. Allow to sum two stereo sources such as a tape, CD, mini disc or MP3 player and combine them into one mono XLR or 1/4-inch output. This allows one channel to be freed up for other important inputs. Phantom block circuit which prevents phantom power going to the input sources.