Re: Wondering if anybody can help me..
what djbass said.
Although you don't seem to be experiencing it, the ground loop (exhibited as a constant low tone "hummmmmmmmmmmmmmmmmmmmmmm") can be rather annoying - if you're going to hear it, it often comes when recording from a mic to the PC soundcard.
What you are hearing may well be RF interferance* from the laptop's transformer. Try moving the transformer as far away from the amp as possible. If you have sufficient cable, plug the laptop in to a socket in the next room and try it like that, as a test.
If the problem still persists, it's not likely to be RF directly, but the transformer may be inducing current fluctuations (either in the supply to the laptop, or back into the ring system in the house).
A final option is that the charging gear in the laptop could be doing it, by the same method. This can be checked by removing the laptop battery and running off the transformer - almost all laptops will allow this, and that way the charging circuits will be disabled.
Either way, laptop power gear is not really designed with quality in mind, so unfortunately you might just have to run off battery if you want perfect sound.
* The best example of this is the most often heard and the most annoying. Hold your mobile phone near a speaker and call someone. Behold the wonders of RF current induction.
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