Just reading a few posts but I would love to try tri-amping. It would just seem wierd doing it with 500+wpc amps even though that means nothing since the preamp controls overall volume. Would the amps driving the tweeters and mids have to have a lower gain setting since you are essentially bypassing the speaker crossovers and running the drivers independently? I would be a bit concerned feeding them the same gain as the woofers
I am not so sure you'd be running the speakers without their internal crossovers--it depends on the speaker brand and model. If the individual drivers when bi- or tri-amped do not go through a crossover inside the speaker, then you would need to provide an external electronic crossover between your preamp and your power amps to prevent damage to the drivers.