Can a single terminal speaker be bi-amped?


Just acquired a second Hitachi HMA 7500, legendary amp from 70s, revamped by Approved Audio, and want to use both amps with my Kef LS50s. I would double up the speaker cables. What damage could I cause?
springbok10
The real reason this is not practical is that amps have a low output impedance and each will, effectively, short-circuit the other when connected.
Thanks very much for very detailed answers, even comprehensible to a non-physicist like me. Guess I wont be bi-amping speakers that are not bi-wirable!
Dividing a passive cross-over is not a difficult procedure for an appropriate technician and well worth the low-cost investment. Especially if you are capable with the mechanics of installing the required additional binding posts.