Pioneer SHF21LR Speaker "8ohm 2 ohm amp" Questions

8ohm Behringer B212 speakers. Is there a resolution and what would it be? I'd need to know more about the amp, but don't forget, amps are rated as their max power... So lets take a 300W/channel stereo

...8ohm speakers I am considering buying....Would these be ok to use as 2 higher up speakers with my Mission 7.1 (All 6ohm) set up, to go above my Tv to make up the 5 inc the center speaker at the front ...

8Ohm house speakers for the job. Aside from anything else, it seems as though there is an awful lot more choice when it comes to car speakers than there is for in-ceiling house speakers. Is it bad for