If you have connected your computer to your home entertainment system and heard a speaker hum, you may need to get rid of background interference caused by differences in electrical resistance between devices.
Xitel Pty Ltd. can oblige you: The company recently released its Ground Loop Isolator to get rid of background interference.
Xitel’s Ground Loop Isolator comprises two RCA male stereo connectors on one end, that plug into your receiver. On the other is a box with two female RCA connectors that you attach to the cable connecting your computer to the stereo. The device breaks the grounding between a computer and stereo.
The Ground Loop Isolator costs US$29.95 and can be purchased direct from Xitel’s Web site.