The problem solver.
The Line Level Shifter from Ebtech is designed to increase or decrease signal voltage (-10dBV and +4dBu) without adding noise. It converts back and forth between balanced (+4dBu) and unbalanced (-10dBV) signals automatically. It also contains Ebtechs Hum Eliminator technology to break ground loops that cause AC hum. 8 channels. 1U rackmount.