Just to save you from blowing something up, be sure the amps are not connected to a common ground at the speaker end. Remove any connection at the speaker that ties the woofer and tweeter terminals together in ANY way. Keep them totally separate. To feed the amps the same signal, just use one of those "Y" connectors that give you two female phono sockets and one phono plug.
Can I bi-amp my speakers with two different amps?
I’m hoping this is an amp question. Can I bi-amp my Revel F52s with two Mark Levinson power amps? A #331 for the top and a #335 for the bottom. How would I make the connections to my preamp? Any other recommendations?