not worth the money... crystal comp 8. AA asassin 8. TB 6.5s n 8. id invest in those for an 8 or smaller. i really want to make that abc for the 2 6.5 TBs.
they are great subs. put a 500/1 on each and you'd be supprised.
they are rather expencive and require quite a bit of air space when compared to other subs out there. you might wanna look into the 8's Trevor mentioned above.