The Radial J+4 is a stereo interface designed to accept unbalanced low output level devices such as instruments, computers or CD players and boost the signal to a balanced +4dB level for easy manipulation in professional environments such as broadcast, recording studios and live touring.·,Stereo preamp boosts signals to +4dB balanced line level·,Increases gain for low output instruments & music players·,Transformer isolated to eliminate noise caused by ground loops·,Plenty of connector options -