Just to follow up.
I have been running the Pioneers TS-W1200PRO's for a couple weeks now in a undersized sealed box that i forgot it had. Absolutely an amazing SQ Sub!
It has no problem crossing at 150hz, although 125hz works great for my set up. VERY musical, detailed, transparent and dynamic more so than i have ever heard from a sub. I played with positioning angle of the box, even though i had some box noise at high volume with 1200 watts on them the stage is up front and super nice. But they really needs a bigger box. As expected they don't dig very deep, just into the upper 20's but it does play lower than i expected especially for a undersized sealed box. I will be building a permanent box this week, ported I'm hoping for lower 20's. Over all taking some of that midbass load off my doors, my system plays a lot louder. IF a good ported box can get it to play 7 or 8hz lower it will be prefect.
