Speaker specs: Sensitivity, & Amp match


Can some help me with this question?
I am purchasing B&W speakers and the specs state the following...

Sensitivity 90dB spl (2.83V 1m)

What does this mean and what should I look for as I examine amplifier and preamp specs (as it relates to sensitivity).
bawilson
Elevick, I could be wrong, but I'm pretty sure to double the perceived volume, an increase of 6 db is needed. Can anyone else confirm this?
Elvick, I think you are safe - the word is percieved and we all percieved differently. Your post coincides with my perception, therefore you are right! :-)
S7horton is correct:)! 6db (spl) *is* "twice". Elevick: You show this yourself quite explicitly, above: As change in spl relates to w change^2, 2x as loud requires 2^2=4x watts. Every 6 db you clearly show x4 watts. Cheers!
Gregm, I think I'm getting confused! As I understand it, a doubling of power results in a (measured) 3db response in sound from a speaker, but the 3db, or even 6db, increase in volume isn't necessarily "percieved" by the listener as a "doubling" in volume. From what do you conclude the 6db increase in volume results in a "percieved" doubling of volume to the listener?