Whirlwind ISO1 Line Isolator and Hum RemoverThe ISO1 is a one channel transformer isolation box and line balancer. Use it to isolate lines to fight hum and buzz in broadcast or live sound applications, or convert unbalanced lines to balanced for long cable runs. A ground lift switch is provided to disconnect the input ground to the output. Features: Single channel line level transformer isolation Use with both 1 4" and XLR connectors Insert in line to combat hum and noise in audio signals