well, with my set-up that i have right now:
2 memphis hpo 12"s
MTX sealed box
Audiobahn 1800 watt amp
Pioneer headunit
Memphis 6 1/2 door speakers
i am getting close to 149 dB. Last show I got 146.7 with a partially blown sub. The voice coils were fried, and i still killed the competition. and got a brandnew sub from the stereo shop
when you win with their products, they love you...
john