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You have a bad set of Audio output IC's for the sub. There is two of them. TDA7293 REPLACE BOTH!!!
There is 4 on one side of board,and 2 on other "also 1 small one" The the two are for the sub,the other 4 are for the main speakers/surround. They sell on Ebay for $6-10 each or a kit of all 6 for $25. I would replace all 6 on your system. To insure that the other's do not go bad after fixing the bad ones.
i have the same problem. haven't tried the fix yet, but someone recommend connecting the two pronged power cord to an adapter that switches it to a 3 pronged (adds the ground prong). i guess the adapters are less than a dollar and can be bought at most places.
It sounds like a capacitor in the power supply is just about to die. With the power disconnected have a look at the large tin can looking gizmos near the power transformer. There could be a couple of them. Leave the unit switched off for a while before going near them they could still pack a splat. Replace them with the same value and make sure they're connected the right way and it should solve your problem.
Whilst in there have a good look for any other smaller capacitors which look as if they're getting rounded at the top. Replace them too.
Either that or dig deep and buy a new one.