After a power outage, my Sony receiver has been making a really loud buzzing noise coming from the receiver itself, not the speakers. This is very annoying because the girls hate it and I have to turn

SOURCE: One speaker buzz when cold

It works fine for a couple of minutes the starts to hum. If you turn up the volume it masks the noise but is till audible, also the video switching cuts out. after examining the components I have seen some heat discoloration in the power suply area and believe it to be power for the video board. disconecting the ribbon cable form the video board the hum goes away, and so does any video wich does'nt matter for me because my monitor does all the HD video switching. hope this may help with some noise problems.

SOURCE: pioneer VSX-D503S receiver-no sound coming

it might need to be rregrounded

SOURCE: Static noise from Front Left Speaker

It would probably be with the speaker. That is easily checked by simply unhooking the speaker and running the test again.

SOURCE: 2 month old ONKYO TX-SR706 speaker circuit problem

Make sure none of your speaker wires are touching. I had this problem. I re connected the wires. If a wire is touching the case it'll short out. It has a built in cut out.

I still have a crackling speaker on one channel but it doesn't cut out anymore.

steve

SOURCE: Alot of loud feedback through speakers, a loud buzzing noise

What sources make it happen or which do not? All buzzing = something in the amplifier end. is it from all speakers or just one?
One external source= RCA cables not grounded. Reconnect them tightly with a twisting motion to wipe off oxidation.