Radial Engineering IceCube IC-1 Balanced Line Isolator and Hum Eliminator Eliminates hum & buzz caused by ground loops Exceptionally linear response from 20Hz to 18kHz Able to handle pro output levels without choking Plug & play easy to use with XLR in & out The steel outer shell is not only more durable, it provides excellent shielding against electromagnetic fields radiated by power cables, dimmers, motors and power supplies - delivering consistently quieter results when deployed