Boston CR9 making funny noise
I have just recentyly purchased a pair of used CR9's and have really enjoyed them, I have been using them as my rear speakers. Well today was the only day that I have had the house to my self and was able to really test them out. I am fearfull that I may have blown one of them. It started to make a funny noise, kind of like re-verberation at about 3/4 volume I am not pushing that much power to them I think at max it is 100w from a pioneer VSX-D811S. I took the speaker out and inspected it and did not see any damage at all so I am not sure what the problem may be. I was just wondering if anyone may be able to help me with this and give me any suggestions.