As many of you know, I've been having a really hard time locating my electrical hum in my room. Well, think I've narrowed it down but I need some help. The power going to my projector is on the same circuit as my recessed lighting which are on Lutron dimmers. Well, I have dual 20 amp receptacles in my room, one on the right side of the room, one on the left. The 20 amp on the right is powering all the gear and the only thing the one on the left is powering is my SVS. I can easily get to the 20 amp on the left side of the room with a little work so my question is, should I run the power off my projector to the 20 amp?
If so, do I have to replace the 20 amp receptacle with a standand 15 amp receptacle or can I just leave the 20 amp receptacle in place and put a standard 15 amp receptacle at the projector? When I run an extension cord from the projector to the dedicated 20 amp on the left, my hum goes away even with the lights on. As you can tell, I know nothing about electrical wiring so before I do this, I need your help. Thanks in advance.