The Line Level Shifter's primary function is to increase or decrease signal voltage back and forth between -10dBV and +4dBu (depending on which way you route through it). The Line Level Shifter also breaks loop antenna that causes ground hum and buzz as well as converting back and forth between balanced and unbalanced connections and preventing the cable from acting as an antenna for noise. Simply place a channel of the Line Level Shifter on the cable connections between the two mismatched pieces of equipment. Will not affect the quality of the audio, it will improve it.
The Line Level Shifters feature 1/4" smart jacks that accept any combination of unbalanced (TS) or balanced (TRS) plugs. These are passive devices (no power required), in cold rolled steel housings, hand-soldered circuit boards with top quality components and hardware.