my speakers hum

Is it possible that these speakers have been wired accidentally in reverse polarity? And I mean, internally or externally by yourself? Try flipping the Positive/Negative Poles around on the speaker cables.

Another option you can play with would be to try varing the speaker cable length between the Amp and Speaker and see if the noise goes away.

@erik_squires

How do you figure that?

Its certainly not the speaker making noise on its own. There is an Amp and speaker wire connecting everything together is there not?

The speaker wire is the conduit to allow the noise to pass thru to the speaker.

The OP said that other speakers didnt have such issues on the same equipment so I dont see the point in tracking down power line related Ghosts in this case. If speaker A is hooked up to the system and there is no noise but on the other hand if speaker B is connected and there is noise how do you figure unhooking your cable box or computer is going to fix the problem? Could be that the amp,speaker, wire combo is not playing well together.

I've been down this road myself in the past fighting a similar issue. The things I've written in my previous post come from direct experience.

I would suggest that you take a step back and look at the issue from 10,000ft first and think of all pieces in the chain and how they work together. Then start laser focusing in on certain areas, one at a time, until you narrow down the culprit.