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Is it true that the more effecient a sub is, the better/louder it is? If so, then which sub(s) would be good to run in my BMW? I would like to run 12's. I tried the Lightning Audio Storm 15 inch, but was not very impressed with it.

It'll be louder, but louder isn't necessarilly better... Unless you're Bill Wolf :) Lightning Audio isn't exactly the most prestigious brand around. It depends what your goals are. Do you need a small box? Sealed, ported, bandpass, transmission line, aperiodic? Lots of power to send? Loud or enough to get by? How much money do you have to spend? You need to figure out what you want based on your application.

think of it like this. a sub with a higher sensitivity takes less power to do the same out put as a sub with a lower sensitivity but lower sensitivity subs tend to have a higher power handling. these are general terms excluding shitty brands.

sensitivity is all measured as 1 watt at 1 meter.....there fore its not teh best indicator of what it will do with a 1000 watts at your dash

Ok, I have a Phoenix Gold Ti1000.2 that, according to Phoenix Gold's testing, Pushes out aroound 1450wrms at 4ohms. I had the amp running 2 PG XMax 12's in a ported box and hitting around 145-146.6db in a 95 Maxima. I now have a 1989 BMW 325i that does not rattle with every bass note and would like to run the same amp and use 2 12's to hopefully attain my goal of 150+. Money can be worked around to obtain this goal, although my wife dissagrees with this very much badly.

Phoenix Gold Titanium Series Class A/B 250W x 2 @ 4ohms stereo / 1000W x 1 @ 4ohms bridged

150 is going to be insanely difficult with 2 12s in a trunk car with only 1000w from an A/B amp. as it stands the loudest trunk car in the world is a fellow team maxxsonics guy and hes held that record for 3 years at 154.2

what does it do at 2ohms or 1 ohms?

blow up

with an 80 amp fuse it cant produce anymore than 1100 watts.

oohh, didnt realize it was a stereo amp.....yeah your gonna need a monoblock with an assload of power