What power conditioner will help in my situation?

Thanks for all your responses. I think I will go the dedicated line route.
To clarify, its not a constant hum, only when I change the fan speed I can hear a low frequency thump in the speaker. I know- don't change the fan speed- Thought maybe a regenerator would work but will look into a dedicated line. Thanks again.

To clarify, its not a constant hum, only when I change the fan speed I can hear a low frequency thump in the speaker.

One of the reasons I asked for clarification of that point is that I don't think we can be totally certain that the means by which the fan or its speed controller is affecting the system is via the power wiring. I wouldn't rule out the possibility that the effect could be occurring as a result of airborne interference (RFI), in which case a dedicated line, as well as power conditioning or regeneration, would not resolve the problem. RFI would of course not be at frequencies that are low enough to be audible, but I don't think we can rule out the possibility that it might cause some circuit in the system to produce a low frequency thump.

So before going to the trouble of having a dedicated line installed, I would repeat the suggestion that was made early in the thread to try running a long extension cord to another room. If that solves the problem, then yes, a dedicated line probably would also.

Regards,
-- Al

I'd also second the thought that a balanced power conditioner like something from Equi=tech might be able to fix the issue. I'd also call a dealer and get their thouhgts. Cable Company carries a number of brands and has a lending system that I think includes power conditioners (it certainly includes cables and headphones).

Seriously, if one is going to get into this electronics/electrical/audiophile game, then short cuts really don't cut it. The ones that do use short cuts end up paying in the end. As the old saying goes, there ain't no such thing as a free lunch. You don't use permanent cheater plug, you don't permanently lift the ground. You find out where the problem is in your system and you fix it the correct way. In this case as in many. Do it right the first time. 1) run dedicated lines first. This means completely separate hot, neutral and grounds per dedicated lines. Do not share neutrals with other circuits. 2) If hum exist in the system, follow the detailed instructions posted by myself and many others. and trace it back to the offending piece of equipment and either fix it or replace it. As I mentioned earlier, it really doesn't cost much for a qualified electrician to run dedicated lines. They know what they are doing. Some charge based on where you live (stay away from those types). Running dedicated lines is pretty basic. Either from the attic down the wall from the panel or from under the house up the wall, or along the walls. If you have plaster walls (the best) some patching is required, which is pretty easy. If you have drywall, well, drywall is pretty inexpensive to replace. do the dedicated lines anyway. You will hear an immediate improvement. But hum is either equipment based (noisy transformer, internal vibration, etc. or a ground loop.

enjoy