Which Amp for uppermost freq' in tri-amped setup?

Sounds like you've got your hands full. I wish you the best in your project and hope you can make it work to your satisfaction. Active multi-amping can be tough to dial in, but it can sound SOOOO nice : )

I ran a 2600 for a while with a set of Klipsch Heresy's. The "warm and smooth" NAD sound complimented the "hot" sound of the horns pretty well. While the 2600 is not a bad amp, it is not "commanding" enough on bottom end. I would sell both of those ( i see that the used prices on these have climbed up somewhat, making it a good time to unload them ) and look for either an Electron Kinetics Eagle, Perreaux PMF-3150, Robertson 6010, Aragon 4004, etc... These are all excellent "bang for the buck" amps when it comes to low frequency reproduction and impact. You might be able to find better amps for bottom end, but you'll be paying a LOT more for it too.

For top end, look for a Forte' 4 / 4A. Class A bias, 50 @ 8, 100 @ 4, etc... and sounds very sweet, airy and delicate. Trounces amps costing WAY more money with much bigger names.

Take these suggestions for what they are worth. That is, slightly less than what you paid for the advice : ) Sean
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Thank you gents very much. I haven't bought anything yet,
still wondering. Sean, your suggestion to sell the NADs
is something I almost did once & still might. I'm building
speakers too, they are not done either. I'm building a
compound/isobaric woofer section (dual 8-ohm drivers),and
thought 2 mono NADs would be a way to start, that is,
without selling my car to buy parts.

Compound's can work out nicely if done carefully. My only concern is with the lower impedance. I think that the NAD would get "mushier" as the load drops. Then again, having two amps with four channels to hit the four drivers would mean that none of them would see anything less than 8 ohms, so that might be a valid approach. That is pretty similar to what i did ( multiple channels to drive multiple drivers ) in one system.

With all of that in mind, give it a go with what you currently have. You have all the gear necessary to actively tri-amp right now. You can play around with what amp runs what frequency range, where your crossover points work best, etc... Once you get things dialed in, you can enjoy until you can afford to move forward with your next amplifier upgrade. Then again, if you get it working and you're happy with the results, you might also save yourself a LOT of time and money. It's worth a try : ) Sean
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I've owned the Bedini and the Pass - the Pass is better but either is a good choice.