Hall Technologies STEREO AUDIO GROUND-LOOP ISOLA

GLI-35MM stereo audio ground-loop isolator and filter with 3.5 mm connectors eliminates ground loop noise between any audio source such as a notebook PC and audio equipment. Uses proprietary audio transformers and filters for total elimination of any spurious buzz and hum in the audio.
The GLI-35MM is simply inserted in series with the audio and it literally eliminates the ground connection between the two sides, passes all the audio while filtering out any noise using high performance audio transformers.