OK guys I've been in the bus for over 11 years now and my primary focus has been SQ with quite a few winnin cars under my belt but where my experience lacks is SPL I can design and build a loud box but where I'm lackin is in TL style boxes that are crazy loud (but sound like ***) where does a guy like me come up with a good program for a spl style enclosure so I can satisfy the odd customer(or just another notch on my own bely) for sick bass. personal record is 143db two15s and 500 watts Zapco amp and polyglass v2 subs sealed
What do you use?

 

The tube boxes actually sound really good, just depends on the tuning/subs/crossover setting...
i have 4" ports for daily driving, and 6" ports for spl.