And maybe I missed the part where I was talking to you. Im going by my experience with PRs, I have heard a lot of them, including 2 15" PR setups PORTED in trunks that were not as loud. Im just saying 3 good 10"s can be louder than that system if he was interested in running 10s. Because he was having doubts. Make more sense?
Maybe you missed the part where you woke up in the morning and joined a public message board and posted something on-line for all to see in a location where the intent is to have lots of people read it to get there input so you can learn. Your a dick and have no useful information to post.
Stop trying to fluff your post count and come back when you have something useful to add. Anyone can say, well this many of this can be louder then that... Anything can be louder then just about anything else if you build the box right. Look what Bose does with a 4 inch driver. Is it because they have 73mm Xmax or something crazy? no, its because they no what there doing, I wasn't going to get this far into it but may as well now.
I bet your 15s are pretty loud, but you had a hard time getting the box in there at 5.5^3 feet right? Now I am going to speak in generals here for all these people trying to get you to change your system. How do you get most 12s (or 10s or anything else for that matter) to truley perform well, to the point where 2 12" subs are going to outperform your 15" sealed subs.... You put them in a LARGE ported box, with a good amount of port area. Now if your gonna go for something thats really gonna move and have considerable output, the port will probably have somewhere like 60 to 80 sq inches of port area. I have built alot of boxes in this range and the key is having enough box volume to still be able to drop really low even with a already low tuning.
To clean this up, your box is pretty close to max right? Thats at 5.5 Cubes. Now take about 1.5^3 feet off the top for a nice big port (the kind that leads to 12s out performing 15s) and your down to 4 cubes on your subs already. IMO if your shooting for a high end 12 in a good ported box to have a noticeable difference in output then your 15s, 2 cubic feet per woofer isn't enough. Just as a example, on my L7 (which has fooled people into thinking I had 15s) is sitting in 3.5^3 feet after all other displacements, so the box itself takes up about 5^3 feet and thats one sub. Not saying there is a direct relationship and 2 = 1o^3 feet, but I think you would want more space then what your going for.
THIS IS ALL IN GENERALS, TAKE IT AT THAT, I know not everyhing is equal, but I have done alot of systems, and this is my experience, trying for a good ported box is gonna take up just as much if not more space.
I say keep what you got. Every one has personal preferance over this brand or that, ported or sealed, whatever. YOU seemed to like it, and YOU drive it. Dont let a bunch of E-haters get you all wound up. It looks good and seems to perform really well. Wait till something breaks to replace it IMO and enjoy it.