the sub naturally player lower. wethier it be a higher MMS or a softer spider pack the driver will naturally have a lower F3.. most woofers thatare designed for ported boxes typically have stiffer spiders. anyway lower QE lower fs woofers will will peaky alittle lower and have a lower F3. unless he listens to just rock id do something with a lower QE/FSsince FS is such an important parameter for a sub.....
OP you can also look at a IA death penalty although you're going to be largely limited by your box size. Unless you're dead set on buying new I would see if you can get in touch with a reputable sub builder or a company willing to customize subs and see if they can accommodate your needs. Sundown or Psi may be a good start if you are looking for new.
---------- Post added at 08:40 PM ---------- Previous post was at 08:39 PM ----------
Money he only has 7" depth! thats the kicker..since FS is such an important parameter for a sub.....
OP you can also look at a IA death penalty although you're going to be largely limited by your box size. Unless you're dead set on buying new I would see if you can get in touch with a reputable sub builder or a company willing to customize subs and see if they can accommodate your needs. Sundown or Psi may be a good start if you are looking for new.