So is a 3.9^3 box too big for a single Btl N2 12" on a Saz-2500? I know that the spec sheets say 1.75-2.5 cubed. It was professionally designed and the person who designed it says that it still falls within the thermal/mechanical specs for this sub, so they dont understand why i am questioning its size. I don't want to damage the sub with over excursion though, so any input would be great. Thanks!

So, go to them and say, it's the same reason why you do not put 2 tons of bricks into a new F-150 and drive it across the country...it is a half ton truck that is designed to carry 1000 pounds of payload in the bed.

The enclosure guidelines are there for good reason, and are there for daily driving and musical installs.

Your mechanical power handling is a little less then half of what it *should* be in an enclosure that large, the sub is going to be excessively boomy and you will probably shred the soft parts.

We've got cut sheets for you use in the tech section below..

Make them watch the video as well, and print the cut sheet for the btl 12 off for them.