James and Inventor,
Thanks for the warm welcome, advice and reassurance that I'm not going to blow things up. The Pioneer manual distinguishes between bi-amping and bi-wiring. It's not clear to me why what I'm intending to do is not bi-amping - I'll be driving different speaker elements with different amplifiers running over different wires from an amp that is designed to bi-amp the front speakers.
The Pioneer 1019 has an OSD menu for speaker setup where you can specify using the back surround channels for front speaker bi-amping. It also has a mic used in a calibration routine that blasts sound (static) from the various attached speakers over a short period. As the bi-amping is designed into the system, I'm hoping that the mic/amp combo will accurately manage to control the separate high and low speaker cones in the WFo-34's.
As you can read, I'm speaking in the future tense, as I haven't found either the speaker wire or time to do this. I'll get back to when I have. I too am skeptical as to whether my ears will be able to detect a difference. The current setup sounds very good but it bothers me that I have all those amps sitting there idle.
Thanks again.