X-Max is not everything! I have compared subs with moderate x-max vs massive x-max and a sub with a large x-max does not necessarily guarantee better performance.

wait... box is set and you are not sure of the size??? is it sealed? Man that's going to sound like crap... you better re-design your boxes volume based on your sub / wattage and all that...

Box and EQ are 50% of the equation.

I built a custom fiber enclosure for a Pioneer TS-SW2501S4 and have been pleasantly surprised. I've owned JL, MB Quart, and Polk subs before and have to say this baby is almost on par in terms of range/rolloff. The output is considerably less, but that may be because I'm running a 10" at 4ohms/250 watts instead of a 12" at 2ohms/500 watts.

I looked at JL, but couldn't find a model at the price point I wanted. I got my Pioneer new for $90 shipped from ebay.

This is so true. I had a 12" MB Quart (RWE304 ?) in a 1.2 cubic foot enclosure and built a fiberglass enclosure that ended up much smaller (~.7). The difference was night and day. The rolloff was terrible and the sub was missing a ton of low end frequencies that were present before.

Yep the wicked cas. spare tire sub enclosure. Now what's good in 10" that will be pushed by the jl 500/5! thanks for the input.
Selling the box is not an option , getting new amp is not an option , selling car is not an option !!! what is the best fit for my set up. :tup: