Screaching noise in speakers still there

tried RF chokes on speaker seads, I put them as close to my amp as possible. Did not change anything. relocated grounds to different spot on frame and did nothing. I can also talk on mic and here my voice through speakers. Not sure what to do. Nothing seems to fix it.

 

The chokes are on the speaker wires. I put them about one inch from the back of the amp where the speaker wires connect to the amp. The amp is a 120 watt max output stereo amp. I have more chokes, I will put some on the speaker leads by the speakers.

 

Ok, the problem is fixed. I have a toggle switch wired to a back up light. some haw power was feeding through toggle into the amp or cb (not sure which one). Replaced toggle and rewired and screach is gone. When I turn on my back up light I still get feedback when mic is keyed. not sure how that is possible but it does it. I can live with that cause I will rarely back up and talk on cb with music on. Thank you for the info and help, I learned a lot.