Rensek
Headphoneus Supremus
I appreciate your enthusiasm for Vandersteen. I love that company, too. Richard really make some fantastic speakers. In fact, I heard the Treos and they are no doubt among the best I've heard. That being said, I've had a chance to demo the Tekton's a couple times and in my opinion it's no contest. DI's are the best speaker I've ever heard regardless of price. They earn their reputation to complete against 30k speakers (again, my humble opinion). They do everyting right and the Dynamics are just incredible. Eric Alexander doing something special with that mid range tweeter array.
In regards to amps for the Vandersteen, I don't think the Aegir has enough juice since the Vandys are so inefficient. (I like to listen at high volumes, too) Vidar would be the better choice here. Tekton's are very efficient, so Aegirs would still deliver even at high volumes.
Were you demoing the DI's in your current listening space with your current components?
If not keep in mind you were also demoing the room and all the components in the chain.