There's an Apogee forum with lots of info, especially in the older archived section.
http://www.apogeeacoustics.com/forum/index.php
I own a pair of Calipers that I picked up for a song and "fixed up". There's only so much that can be done though by yourself. A qualified Apogee technician is needed to replace bass ribbons since the process is detailed and difficult and a mess up means a whole new driver needs to be bought.
If you can score any Apogee from someone who lives near you then you should give them a try. I don't think I would trust these being shipped to me though - too fragile. They are 30 years old in general and need some TLC for sure.
http://www.apogeeacoustics.com/forum/index.php
I own a pair of Calipers that I picked up for a song and "fixed up". There's only so much that can be done though by yourself. A qualified Apogee technician is needed to replace bass ribbons since the process is detailed and difficult and a mess up means a whole new driver needs to be bought.
If you can score any Apogee from someone who lives near you then you should give them a try. I don't think I would trust these being shipped to me though - too fragile. They are 30 years old in general and need some TLC for sure.