Hello. I have a Signet sp 200 15 inch sub whose driver no longer works. Since they have gone under I was wondering what type of driver could replace it. It's 24w by 20h by 18d. The cutout radius is 14 inches exactly with 8 inch mounting depth. I purchased it used some time ago and would like to get it up and running again. The built in amp is a Bash a-300 if that has any bearing on what type of driver to use.