Well, we all use the same Internet that you do, so if you can’t find anything on them we won’t either, unless you’re lucky enough to run across someone else who happens to have original documentation for them
There’s no need to worry about overdriving them. Speakers, specifically their woofers, will make rude noises when you over drive them. Just use some common sense and you’ll be fine.
Regards,
Wayne A. Pflughaupt