Reddit reviews APC AV C Type 2-Outlet Wall Mount Power Filter, 120V

If it doesn't help, you may need an actual line filter. like so... https://www.amazon.com/APC-2-Outlet-Mount-Power-Filter/dp/B000OF4R8C

I have only 2 wires in the sockets who makes noise as opposed to 3 in the good one, so I think it's not grounded.

I didn't know that about the surge protectors, I think I have to invest in another one because I didn't have this noise before. Do you have any ideas?
A power filter can also do the trick but they are expensive. I don't think you have to replace it in the future so it may be a good investment after all.

Your case is a bit more tricky because you have the problem at the university but a little surge protector can solve it. But like you said, they don't tell what technology they use...

Have you tried plugging the Christmas lights with the in-line dimmer into a quality power conditioner?

Something like this: https://www.amazon.com/APC-2-Outlet-Mount-Power-Filter/dp/B000OF4R8C/ref=sr_1_1?ie=UTF8&qid=1480387480&sr=8-1&keywords=apc+c2

I have solved similar issues using power conditioners in the past.

My issue is while using my computer I can hear a somewhat high-pitched buzzing. It varies depending on the brightness of what is being displayed on my monitor and whether I am scrolling or not. If I am doing something intensive like running a demanding video-game then the buzzing will get really obnoxious.

My stop-gap solution has been to run the A500 at about 25% on the volume knobs and then run higher gain through my USP-1 preamp. I have put in an APC Power Filter but it hasn't solved the problem. Maybe if I run just the computer or just the amp into it....

1. Adjust the subwoofer level to roughly match.
   
   
2. Does the Klipsch output full range to the sub or is there a crossover? If no crossover, do not use LFE, you should experiment between 50Hz-90Hz, fine where you think the Klipsch’s bass rolls-off and start from there.
   
   
3. Adjust the phase/polarity to match; play a sine wave at the crossover frequency on your system and adjust the phase/polarity until it’s the loudest at the listening position (if the sub is not far away, have someone help you).
   
   
4. Your speakers are likely plugged into the same circuit as your computer, which likely is creating a ground loop. Either get a power filter or run them off an extension cord connected to another room (that’s on a different circuit).