Check the listing for details. Radial SB-6 Isolator 2-channel Line Isolator. Condition: New. Listed at 149.99 USD. Transformer-equipped, 2-channel Passive Isolation Box If you're experiencing noise issues from pairing unbalanced and consumer-level gear (guitar, DJ equipment, and laptop and mobile audio) with pro audio equipment, Sweetwater invites you to step into a new world of buzz-free performance with the Radial StageBug SB-6 passive stereo line isolator. This fully passive (requires no power or phantom power) 2-channel isolator eliminates the 60Hz hum you get from unbalanced signals. Two independent isolation transformers and a choice analog signal path give you a supremely clean and uncolored signal path that's quite linear from 20Hz to 20kHz. The StageBug SB-6's onboard polarity switch corrects frequency cancellations when used with stereo playback systems.