I just bought a pair of definitive technology bp7006s on eBay and I had to travel about 800 miles to get them. Anyway I got them home and connected them to my Dennon 3310 amp and one works flawlessly,but the other does not. The one that's broken the back speaker and sub work fine but the front speaker doesn't. What's wrong with it and if it's broken how much would it be to fix it? Thanks.