Whirlwind ISO-2 Dual Line Level Isolator and Balancer with Ground Lift Switches and Phase SwitchThe ISO 2 is a two channel isolation box and line balancer. As an isolation unit, use it to isolate lines to press and video feeds or on stage power amps. It's a handy hum and buzz fighter for broadcast or live sound applications. As a balancer, it converts unbalanced lines from CD players, tape decks, etc. to balanced for long cable runs. Features XLR and 1 4 inputs (accepts TRS or TS unbalanced) Ground lift button Polarity reverse button (Channel 2