I now have a 9.2 setup with SDA2B's as fronts, Surrounds #A and Surrounds #B, and Monitor 10's as rears with two M&K subs. It sounds fabulous and my Denon 3808 AVR has no problem driving all of the speakers; there is plenty of head room. It may be a bit of self-indulgence but so be it :)
Now. What do I do with the pair of SDA2B Studios one of which has dead midwoofers? Do I fix them and sell them? Use them in another TV room in my house, or sell them as is? Break them down and sell them for parts?
Something to ponder the rest of the evening while I am enjoying my new setup.
Thanks to every one who has helped me understand more about Polk vintage speakers. I look forward to trying to help others as much as I can.