Dumb lo-fi question.

Wow thats a tough one dude 12.5 in each  maybe??

Yeah depends on many factors of course - much like millercarbon wrote. You really need to know how much power your speakers will draw from your receiver. The speakers have a sensitivity rating and an ohm rating, which is a good start. Just follow the passage from millercarbon about that ohm rating and find the sensitivity rating on the speakers.  Also, older receivers tend to need parts like capacitors.... so it may need serviced too!!

Thanks guys. That's the info I needed. 

@n80 ...heck of a question. Had an older two channel HK with the same feature. Speakers A, speakers B, or both. I could never tell any difference when set to A&B. It was like the load didn't matter, still had that same power to all four.

I remember the manual didn't offer that info either, only that two channels were X amount of wattage, although something about larger/better caps for each channel.
Hmph...interesting responses above.

I guess a better way to phrase my question is did these old receivers ever come with two separate amps inside...one for speakers A and one for speakers B. I assume the answer is no.....but it would have been a neat feature.