o do it correctly is much more involved than merely putting an external x/o and a second amp onto a pair of loudspeakers. The internal speaker-level x/o must be discarded, the outboard line-level x/o doing all the filtering.The whole idea was simple, to vertical bi-amp using the speakers internal xover.
All the other talk now has just confused the s**t out of OP into now giving up, so sad.
He could have have a great sound with the KISS horizontal bi-amp setup with these two amps.
Cheers George