Sorry, Art, but it does sound your over-top about all this.

You have listened to a number of amps that are considered be top-notch and represent a range of technology and character. Yet you say your not entirely satisfied with any of them together with you Vandersteens. Humm ... the evidence is shrieking at you that it's the Vandersteens that aren't doing if for you, but you reject that common sense evidence, instead you try amp after amp.

I'm not entirely sure what your are taking about when you mention "loudness" re. the Supernait. Don't forget that the volume control setting is, in itself, irrelevant. Yes, I believe that Naim amps have a reputation of lots of PRaT, but plugging into the wallsock should, if anything, increase the PRaT. Please take a deep breath and explain this issue in a more delibrate manner.