tvuong... I am sorry you feel that way about the BIC's. There is no perfect company and I believe you just got lemons. Cuz I have heard the Polk Monitor Towers and IMO they don't even come close to the Acoustech towers I have. But as long as you are happy with what you have now that's all that matters.
I know when I had 87db speakers Audyssey would set my trim levels anywhere from +2db to +6db, BUT with the Acoustechs Audyssey sets my trim levels between -6db and -2db. So in my situation I do believe that they are very efficient and in the mid to upper 90db range. Audyssey also had my -3db point (so where it set the xovers) on my towers to 40hz, center to 60hz, and surrounds to 50hz. But of course that's not how I have them, I have them all at 80hz (THX) crossover.