Since it is a package system Bose feels no need to give you any specifics about the individual parts.
If you need to use the speakers with a different system you would have to be careful as some Bose are 1.2 ohms which will blow up receivers and amps, If you own a multimeter measure the DC resistance across the terminal of the speaker. Your reading will be lower than the nominal impedance give in a speaker spec but will be in the general area.
Here is some info on doing that
https
/www.google.com/search?q=speaker+impedance+measure+how+to&ie=utf-8&oe=utf-8#
As for power handling it probably won't handle much since the entire system won't draw more than 75 watts from the wall outlet and only a small part of that is turned into amplifier power and an even smaller amount into power for one speaker. As a guess you probably need 10-20 watts into the impedance of the speaker.