if your supposedly hitting 146 now off 700 watts and want to hit 150 you will need at least 1400 watts to hit 149. 3dB gain takes at least double the power. Here read this. Car Audio Speakers Overview
Not trying to start an Edick thread war but I do not believe 146 with 700 watts. Ive done a few comps back in the day too and had my share of 140+dB setups.