Usb Audio

How Do I Get Rid of This Background Hum?

I just bought a Tascam US-100 USB audio interface to record vocals and piano onto my computer but every time I record I get this loud hum noise in the background. I'm using a Shure SM58 microphone which is a pretty descent. Im thinking it has something to do with the audio interface because I can plug my rock band mic straight into the computer and I don't get the background hum. Any idea what might be the problem?

sounds like a ground loop problem..

quick look around here http://www.gearslutz.com/board/geekslutz-forum/165001-laptop-usb-audio-interface-annoying-ground-loop-noise.html makes me think that it could be caused by your power supply....

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