Crackling seems to be coming from central speaker

Panasonic SC PT860 Manuals
The above link is the owner's manual - it may help.
Here are some other ideas:
Try to find out if the crackling sound is coming from all speakers or just one - you may just have one bad speaker.
If the crackling happens at high volume settings, you may be overdriving the system - you'll just have to turn it down!
Try turning down the bass or the subwoofer level.
Is the crackling present with all sources (TV, cable, DVD, bluetooth)?

So if you bought enclosures that are premade AND had the speakers installed, you need to see if there is a cross over network installed in them

The crackling (which sounded a little like a geiger counter) which I could hear when the oven was NOT running was coming from the speaker (where the beeps come from). I unplugged the oven, found the little speaker on the circuit board, yanked one of the wires off of it, and the crackling was be gone.

Most cell phone cause problems with electronics and computers. Have them turn the cell off and enter again. Maybee this is the problem.

I'm sure you have figured this one out. TV itself is causing the problems.
The circuit board that produces the audio signal seems to be the problem.
Before you call the repairman, go to the web site Shopjimmy.com just to get an idea of what the parts will cost. That way he doesn't rip you off.

I hope I answered your question correctly. Please rate me. :)

Not sure what model but there is a coil on some LG LCDs that needs to be replaced on the SMPS.

I just bought a used 60 inch rear projection tv. The picture is fine except I have a crackling sound coming from the front of the tv also. What's the deal?

check audio cables wiggle them around if no difference in sound check other inputs if they all crackle call for service it sould be under warranty probably in the speakers or the input board

That black disc is the "backup" alarm if you lose power.... The battery then takes over and "buzzs" throught that little speaker too wake you... even tho there is no power... Mine buzzes too... cut that little speaker outta there.!

Robert

Hi, I have exactly the same prob and I belive that it is in the amp module?! I am going to take mine in for repair as my other sony HT amp has just give up the ghost, (STR-DE435), it has a protector prob and is probably not worth repairing, although it is a great amp. If anyone knows the solution to this prob it would be great to hear it!!!