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check the speaker/s. If found OK; check and replace the damaged component/s at its audio output section circuit board. If needy, replace this board as card basis. If you wish to get some details; check the site linked here. Pull up older posts. Search the site by type in the "brand name" to your device; in the "Search box at the top right of the display window of the Homepage" to get gathered related posts. http://electronicshelponline.blogspot.com/
If you severely modified the load to the amp by running more speakers than it's designed to drive and/or at a lower impedence, well, are you surprised?
It only pushes around 25 watts/channel AT TEN PERCENT DISTORTION through a carefully and unrealistically limited bandwidth specification.
Running 'clean' (under, say, 1% distortion throughout th 20-20000hz range) it probably only pushes 10 watts/channel. Once an amp is taxed beyond it's clean abilities it will start to distort, badly, and distortion will kill speakers and maybe the amp itself.
Is it related to certain sources only - try new or reseated cables,swap it to a different input; single channel - swap to isolate; or certain controls that have become noisy? A shop might be able to get some tuner cleaner into them.
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