On which mic? Term-lab? It takes allot to get to 150 in SPL on a TL mic.

X2 thoes are some wild claims....

Not really guys. I've seen guys pull off a 150+ with a 10" Type R. If you know how to properly set everything up, it can be attained.

Please......explain

Ive been to many comps as a spectator and have seen systems with 10+ 12'* and about 15K watts and get just above 150 DB

but we stiill dont know what sub Hans has and what Mic it was metered on

The problem with most people is that they have the potential to break 150+ no problem but their setups are more for daily driving and not SPL competition all the time. Check out thecaraudiobox.com sometime and see what scores he has pulled off with some very cheap but simple designs. Getting a good score mostly depends on the box that the sub is in and most people don't have huge boom boxes to achieve the very high scores.

My truck has a ported bed with 4 12s in a ported box and it hits 144.7 on the meter.
Although it is so loud that my gf doesn't let me play it in the garage, because it knocks pictures off the wall in the living room.

My 2 15s in my Bonneville hit 139 and were really loud too.

150 is a little far fetched for 1 sub in a bonneville

As far as set up, this is true, but 150 needs massive amounts of power as well as a custom box design.

There is a box called the Double shot that I read up on a while ago when thinking of competing, but it never happened.

http://www.nolteaudio.com/catalog/

I spoke with a few people a while ago who have purchased a doubleshot snailshell box which was insanely loud. I never heard one in person though.