Currently Being ModeratedDec 7, 2012 6:48 PM (in response to Doubledashie)Re: USB Port Preferences
I only offer a minor point of reference given that you have not had any responses to date.
Im sure there is a more technical / accurate answer out there, but in my opinion the USB port can be a bit of a noise magnet. My own set up uses a fairly elderly computer and can be quite noisy, and like you I get different noise levels dependant upon the power modes. It is also possible to remove some addional noise be ensuring other programs that may constantly access disks etc are disabled, but ultimately I believe if you have a noisy PC you have a noisy PC (assuming you have eliminated ground loops etc).
One other thing you could try is other audio inputs e.g SPDIF if you PC is so equipped. I believe that many people here use the auidio inputs on deprate interfaces rather than the USB connection.
I hope you find a quieter solution.