I understand the concept of how the loudness adds on.
However, what really confuses me is the power handling spec of 25-100 watts/metre.
Does that mean below 25watts and you're screwed?
I have also read that with every doubling of distance, 6dB is lost. assuming I'm listening from 3-4 metres away, I would be able to extract about 75-80dB with consideration of the peaks. Using a physics text book, this is considered as between a vacuum cleaner and busy traffic. Seriously, I dont know if that's loud enough or not.

BTW, are there any other loudspeakers out there that have higher sensitivity, but better power handling that have similar sound of B&W? I like B&W's warm vocal midrange.