I have the Visonik Sub8 sub woofer. I'm very happy with this sub woofer it have a very good sound also in the lower freq. But now i have a problem that he is broken. I looks like that the spool of the speaker is going to the magnet of the speaker. It is a very strange sound. But the real problem is that this is the second time that i have this. So now the company is going to give me a new one. But wat i want to know is wat could this be ? Because i didn't want that this Will happened another time !!