Bought, connected, and... now I know, that this is the most needed equipment in a home sound studio. It "removes" all noises, clicks, etc. from the sound by filtering AC power. Sound is clean now, as never before. Additionally, it protects your electronic/electric devices from sudden voltage rise. It does what is designed for. One star less for delicate goose lamp dimmer knob and "moving" out-sockets. Over all, this is the great product, I trully recommend.