Seems unlikely that a totally different technology like Be drivers would just fit a carefully engineered speaker design - the crossover frequencies and electrical requirements might be quite different. Maybe with a special crossover kit, but just as a drop in replacement, it seems unlikely.
Since Usher sells their drivers, you should be able to obtain specs for the drivers in your current speakers as well as the Be drivers and compare their specs as far as freq. response, imedance and phase go to see if they seem to be a close match.
Since Usher sells their drivers, you should be able to obtain specs for the drivers in your current speakers as well as the Be drivers and compare their specs as far as freq. response, imedance and phase go to see if they seem to be a close match.