The LLS-2 Line Level Shifter's primary function is to increase or decrease signal voltage back and forth between -10dBV and +4dBu (depending on which way your 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 prevents 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.