mono amp connections.

no, no, yes

Hi
If and when your speakers are bi-wireable you must connect the outputs of your right channel bass amp to the low inputs of your bi-wireable right channel speaker.The outputs of your mid-high frequencies right channel amp to the inputs of your right channel bi-wireable high-inputs.
Repeat the same for the left channel.Obviously positive to positive and negative to negative.That is called passive bi-amping and is used with bi-wireable speakers that provide inputs for low and high .The internal crossover does the signal spliting.For active bi-amping you need an external crossover.Most people do passive,like myself.Carefull matching of amps is important.An all Bryston system is good.
I hope this helps,and you probably were aware of it anyway,but I didn't quite understand your question either.
George

Jphii, GREAT answer!

Biamping always seems a bit too complicated for my tastes. It's not easy to do effectively, and so many neophites seem eager to try. BiWIRING is complicated enough!

Duff, if the amps aren't identical, and it sounds as if they aren't, the amp with the highest voltage gain will need a volume control or the sound from your speaker will be perhaps-seriously out of balance.
.