Proac response D2 or Harbeth for a Leben cs-600

The Proac D2 is one of the most mediocre speakers from Proac factory. The Response 1SC was a lot superior. Harbeths have anyway never impressed me. Look at the Focus Audio FS788 if you are looking at full range sound. They are on the warm side of the neutral and present a huge open airy soundstage. The Leben would really work well these.

Pani sounds like you were turned down for a dealership on these brands and have an axe to grind.

Audioconnection, your reaction is hilarious :).
I have never thought about getting into audio commercially because I strongly believe, the moment one does this for money he is no more enjoying the hobby, all he cares for is money making.

Anyway, I do have a couple of extensive threads on AA which I had started when I was looking at upgrading from my Dynaudio Contours about a year back. Harbeth and Proac were on top of my list at that time. I was almost ready to buy blind but was advised strongly to listen to them. After auditioning they were on the bottom of my list !!!!
Upgrading from a quality speaker like a Contour 1.3SE the deficiencies of these speakers were evident within minutes of audition, however I did give them a fair chance and listened to them multiple times to believe my own findings.
I finally bought the ATC.

Yes Nolitan, ATCs are a different breed. They turned out to be the best speakers among the 50 odd speakers I heard when I was at Singapore shopping for my next speakers. They speak truth with such genuine-ness and authenticity that you would even enjoy poor recordings on them as long as there is some good music in that recording. Basically you would not hate them for telling the truth. Finally, it is the God of Tone and Timbre !! You can tell the difference between a Steinway and a Yamaha in seconds, just by the tone.

I am yet to get into their actives. However I have managed to mate a good tube preamp with a Symphonic Line power amp driving the speakers.

But I would be amazed if a high quality high powered tube amp doesnt work with the ATC !! Though they are low in sensitivity they are not difficult loads. A nice 845 based tube amp putting out 100 watts per channel should work well I guess.