Thanks, Russellc! I appreciate the info. I will contact Great Plaines. Can you tell by looking whether or not the driver is a 902 of any incarnation? The numbers I can see look to be serial numbers.
After spending all night
looking through many many posts and literature, and now an affirmation by EarlK, I'm pretty sure the diaphragms are aluminum:
http://www.audioheritage.org/vbullet...ad.php?t=18913
I read that there is a "light" version however, so I'll ask Bill about that. My speakers will be used for home Hi Fi and "easy" studio monitoring. Nothing too taxing, so the diaphragms won't be too stressed.
Best wishes.