Radio Design Labs has come up with the AV-HK1 Hum Killer Transformer to give you ground isolation in an unbalanced line with high impedance audio inputs. Both input and output connections are provided on gold-plated phono jacks. Each input jack shield is electrically isolated from the case and from the output ground. The shield connection of the output jacks are connected to the case shield.
This rugged transformer is designed to be taken on the road and will withstand travel conditions but it also works well as an installed unit, simply attach the included mounting bracket and you're in business.
If you find that you use a lot of stereo mini-jacks while working, never fear, the AV-HK1 comes with adapters so an instant and convenient interface is right at hand.