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The speakers cone usually made from polyethelene or fiber can be your problem the only way to fix it is to replace it with a new speaker. Over time cones become brittle and dry out or for a better word rot or decay. This causes crackeling in your speakers sound quality. Hope this helps you out.
Is this a NEW problem or has it always been like this? What modes or sources are affected? Generally, crackling, scratchty sound is either overdrive distortion, speakers being pushed too hard, or blown speakers.
What is the exact model. Can't find the manual for "517v".
Could be bad, swap it with another channel. if the problem is still in the same speaker the speaker is bad. if it still crackels in the other speaker the problem is in the amp.
Maybe a capacitor in the amp section is making this problem.The only way to find out is to check receiver in service and find which capacitor is bad...but this is not so easy
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