15'' SW9152 vs 12'' SW9122

I am looking into getting a new system. I haven't had one in a while, but I have heard so very nice thing's about Eclipse Sub's. The thing is I have never had a 15" sub's I mostly kept to 12"s. What's the difference between the two? Is there a major difference? Right now at the moment I have enough to at least get one of the two. But I was mainly wanting to keep it to one sub. That will hit very hard to keep some trunk room. I have had friends who have had only one sub That could take my breath away. Is the sub capable of that?

What would be my best option I want to feel like Tyson is knocking me in the back. I may in the future I may add another of the same model sub to the sytem just looking for my best option for now.. Oh and I have a 90 Honda Accord if it matter's, the seat's feel kinda think I used to just raise the backseat down, I have been thinking about sawing out the back where the armrest is for ventalation to come through the car cause my old sub's had so much pressure in the trunk it just about blew my 6 1.5 speakers through the back window.

Also I see alot of MA Audio sub's are they any good the XL serie's. I have heard the Kore15 is but that is alot  of $$$.

Eclipse makes quality subwoofers.  I have only heard a couple - and no 15"s - but generally the larger woofer will be 1) slightly more efficient 2) handle slightly more power 3) have slightly better low frequency extension 4) cost slighty more.

In general I would go with the 15" if you have the trunk space.  It will be easier to drive to your desired volume levels.

Oh No,

Now I'm lost after seeing those Brahmas (I know it's probably spelled wrong) in action. And now seeing those MTX 9500 which is going to be the better woofer at the best price? Also I hear alot about those Alunimum Eclipse sub's sounding just as good as the Titanium's. So if I did choose Eclipse would my best choice be for the Alum's or the new titan. series? And what is the best model in the Aluninum series? I don't wanna pay two or 3 hundred more just to have a very slight quality difference.

Also where can you find a dealer online that has good priceing on those Adire's? I have no dealer around my area or near my area?

So I'm narrowing it down to

Brahmas 15"

MTX 9500 DVC 15"

Eclipse Titanium or Aluminum 15"