For frequency response, power rating and some explanation of why publish less specifications then you may be used to please try this link:http://musiciansupport.bose.com/faq_repair.aspx?jsessionid=#response
We feel, that many of the typical published specifications are more confusing than helpful mostly because they are either poorly defined, have significantly varying measurement techniques, or simply have little relevance for the behavior of the product in a real-world application.
Thus being said, our L1 speaker uses 24 2.5" inch cone drivers with a total power rating of about 500 Watt RMS. The B1 bass module uses 2 6.5" cone drivers with about 125 Watt RMS power rating. A system with 2 bass modules would provide 750 Watts of power.
SNR depends really on how you define it (and what your measurement conditions are). Using our internal process the system measures 104 dB SNR, but how that compares to other manufacturer's numbers depends on how whatever process they are using.
Hope that helps