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Question: Has Onkyo HT-SR800 a known sub-woofer issue?

Bought my Onkyo HT-SR800 in August 2007. When it worked it was great. The subwoofer and amplifier failed two times and had 2 lengthy repairs under warranty. Now, after 3 years and 4 months it quit again with the same issue. I don't know if this is a single "lemon" I bought or it this is a known issue. Does anyone have the same problems with Onkyo HT series?