[billyo]

you can get a hum elliminator from radio shack for $15.00 dollars, or the one from ebtech for $60.00, i have both of them, a found that the one from radio schack is easier to work with, just plug your laptop cable to it and them plug the hum elliminator to the power source, and also ebtech sells a hum elliminator for your mixing board too, they have 1 or 2 channels..you can choose from.