difference between 90 rms and 150 rms

hi, i am thinking of redoing my speakers and right now they are running off of 90 rms and i want to up the watts to around 150 because i want louder from my speakers. and i am wondering how big of difference is 150 from 90.

10*log(150/90) = 2.2 dB

more power is for headroom, not really loudness

the best way to get more volume is to find more efficent speakers. What is the efficiency of your current mid/tweets ?

87dB / W(1m. i was looking at either diamond audio ones that had 91 or jl that had 90.
ok i found my next speakers. JL Audio XR650-CSi 200 bucks on egay.