You guys are probably getting tired of my wishiwashiness. I thought I narrowed it down to the SVS PB10-ISD after comparing it to others in the same price range, but now...

After reading a few more threads, I kept coming across the Titanic MKIII 12" kit. Sounds like buidling it is a no-brainer for someone who can use tools. The price difference between these two is relatively minor, with $536 shipped for the Titanic and $480 shipped for the PB10. OK, now which one to get?

I'll be using the sub for mostly HT, paired with Energy C-8s up front, an Energy AC300 center, and Energy 2.2 rears. The room is medium/large with 8' ceiling.

Bottom line, it seems like the PB10 goes lower (to under 20 Hz), and probably flatter while doing it. The Titanic goes to about 25 Hz, but can go louder. The difference in size and appearance quality is not an issue for me. The lack of a crossover setting on the PB10 is not an issue.

I understand that the Titanic is a sealed unit, and that the SVS is not. But I'm not sure how this translates into real world performance between the two subs at issue.

A review I read measured the SPL of the PB10 at between 104 and 107 during some sections of bass-heavy movies in a mid-sized room. The Parts Express website listed in-room SPL of 110 dB for the Titanic (the environment was not specified) My first question is, what do these numbers mean in a real world envirnoment for my room for HT?

For my medium/large room, it seems like the PB10 would be more accurate and would go lower if I kept it at moderate levels. But if I listened at high volume levels, the Titanic would have the edge. I'm drawing this conclusion based only on the numbers.

Because of practical considerations, the sub is going to be placed directly behind the seating area, against one wall and 2 to 10 feet from the corner. With the sub so close to the listener (about 3 to 6 feet away from the ears), would I really benefit from the Titanic 12", even in a medium/large room, over the PB10?

Is there any other factor or issue I should consider?

Thanks for all your patience and all your prior responses. It seems like the more answers I get, the more questions I have. This is what happens when youhave more time than money.