I have ripped my CD collection to an external hard drive and play using Musichi software on a netbook and Cambridge DAC via a Quad amp to Quad ELS speakers. Not the easiest to set up but done now. However I am suddenly getting speaker hum when switching the power supply adaptor on and even more with the hard drive on. Its a new problem, all worked well at first. #
I have isolated each and every component and its those two items that are the issue. I assume its some form of feedback. I have swapped power adaptors and hard drives but the problem still returns.
Any solutions or explanation?