Quick note on speakers: most 'shielded' speakers do not actually shield magnetic 'near fields' very well. This is particularly so for sub-woofers. Near field affects of magnetic fields are actually rather difficult/expensive to deal with, and generally most designers just use spacial isolation rather than shielding to eleviate detriment to other systems. My brother completely destroyed one computer from running it next to his sub-woofer under his desk. I know this is not the problem here, but just thought I would mention it as it came up in discussion.
