Ct0517, I enjoyed reading your Experiments. I wanted to ad from my experience as a live sound engineer and system designer (which has been my career for 20 years now) We have found that with concert sound systems, we use the same type and model amp for powering the high, mids, and lows. It used to be considered ok to use a smaller amp on the highs lets say than on the mids or lows (in a 3-way system) but when using the same amp for all bands, they all work at the same pace. ie the same voltage gain, same slew rate, same damping factor, etc..
A few years ago I tried just for fun with my Martin Logans putting a VTL tube anp on the panels and a Mac amp on the woofers, and then vise versa. It was terrible. More like a bad combination of bookshelf and subs. Again both amps were good, but they responded much different than the other. So if one were to consider Bi-Amping, especially passive ( full range amps drive the low and hi inputs on the speaker crossovers) as opposed to active with and external electronic crossover, I would try it with matched amps.
