Question on using bi-amp...

i do not know internally bat units but i assume that these outputs shunt each other and cannot work together at the same time or even the ground loop problem may occur when you will try to connect both at the same time. the regular way is to acquire either y-connector or active crossover.
for turning ON and OFF you should arrange an A/B switch but why would you want to use one of the amps if you're ready to bi-amp or how the hell many A/B compare tests you should run to find out the best point??? if you unswitch unused one you will have to connect jumpers to the binding posts(do you have bi-wired speakers?) so you will not escape connecting and re-connecting buzz anyway...
i have an ear-speaker adapter and speakers and i mounted toggle switches onto each of my monoblocks and thus i can re-direct my amps to drive different speakers.

If I understand your message correctly, you are not trying to biamp in the normal sense but instead, you are trying to connect both amps to the same set of speaker terminals such that you can switch amp at will (base on the kind of music you want to play I presume). I strongly suggest against it because if you forget to turn off one amp before turning the other one on, you will fire both amps and your speakers. Even the amp is turned off, it will definitly have ill effect to the other amp and to the sound in general.

Don't do it.

yes Sidssp.that is exactly what i want to do.and sometimes i rather use a SS then tube on a certain hotday and try to find a quickest way to un hook all the connects from 1 amp and re-hook it on another..i guess,there is no easy way..thanks