If a speaker, (i.e, 3 or 4 way) has a sensitivity of 101db, 1w @ 1m, am I to assume that all of the drivers in the array are of this average efficiency, or does the box contribute to this . I have looked for speakers with high sensitivity ratings, and there are not that many to be found, several woofers, at best? How do these high end manufacturer's obtain these extremely efficient set-ups? It also seems that the passive crossovers found in most would also negate some level of sensitivty.