high pitch interference when using ua25ex

I had this problem before with my  old m audo fast tracker and old motherboard and fan, so I upgraded my motherboard and changed the fan and still had interference.  Not as bad but still had it, I tried my maudo fast track on another system made very strange noises so decided it must be broken,  so I thought it must be that so I got a UA 25 ex and still got the problem its better but still there.  There is no noise when not making sound but if I even go to play a mp3 in media player I get this high pitch interference I have changed interconnects what else can I do.  Could it be speaker positioning or my amp I got a pair of celestion dl6 and a Pioneer a 400 (old school)all on the desk could it be all too close I have tried moving stuff around but am in a small room.





stu



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