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I have a kenwood home stereo system and one day my husband decided to turn it up really loud and when he did it made a loud po

You could have "blown" a speaker or damaged the amp. Since you attempted to post your question in the title, there is info missing. Please repost your question.
 
My stereo make a loud popping sound one day when my husband turned it up really loud, and after that my right speaker wasn't working, I am thinking it has something to do with the port for the right speaker, because i tried hooking the right speaker into the left port and it worked fine, so i know for sure it's not the speaker. How can i find out exactly what the problem is?
 
OK, you have narrowed it down to the amp. You could attempt to get it repaired, but with the cost of repair compared to a new unit with a lot more features, it would be difficult to justify repair.