speaker issues

Problem: When the air conditioner unit turns on and when it turns off, if the A/V receiver is on, the front and rear speakers emit a brief but audible click/pop. Background: I live in a rented condo (i.e., assume I cannot do electrical work on the unit). The furnace room is situated in one...

Hi everyone, I'm quite new to speaker systems, I've recently bought Edifiers S730 2.1 speakers, 1x sub with 2x satellite speakers along with it. However after connecting everything using included speaker wires, and then connecting them to my PC, I've noticed there's a high pitched kind of...