TA, does the bi-amping you describe accomplish anything more than upping the wattage to each side of the speaker? If you have discrete XO paths for the drivers, then each passive XO will screen out those portions of the signal which should not go to the respective drivers, yes? If you have an electronic XO between the pre and powers, with an XO frequency appropriate to the speaker XO point, then the amp that powers the woofers will present only signal that the woofer can use. Similarly, the electronic XO would pass only HF signal to the amp for the tweets or mids/tweets. If the system is 3-way or more, the passive XO in the speaker, for he mid/HF, would divvy up the signal for the respective drivers, mids, tweets, supers, as the case may be. As I understand it, the sonic gains come from each amp being focused on the part of the signal that its driver(s) will use, making more efficient use of the power signal from each amp.
Do I have this correct, or am I all wet, here?