Joost/Alexandre,
I've been thinking about how to answer this question. I've had a love/hate relationship with my TAD CR-1's. They are amazing speakers and demand a lot from the electronics and music being played. When it's right, OMG! I don't think there's much better. I've been an early adopter of the Dartzeel 108, eventually adding the 18NS. There is no doubt that Dartzeel is one of the finest amps/preamp on the planet. When I introduced the Dart 108 to my CR-1's, I knew this is a special combo. Adding the preamp only confirmed what I was hearing. Dartzeel on my TADs is just a natural, grain free presentation. Amazing detail with zero harshness, well defined bass without being bloated. The Dart 108 lets everything pass through it without editorializing the sound. If your source is really good, you will surely be rewarded. If your music is poorly recorded or somewhat harsh, this combo will not sugar coat it and the TADs can spotlight those poorer recording. For me, this can be uncomfortable at times. Fast forward to today and I have since added the D'Agostino Momentum stereo amp and Momentum preamp. I really liked what the Momentum amp did for my CR-1's. The sound is fuller, bigger with more meat on the bone. Some may find that tiring over the long haul. Since adding the companion Momentum preamp to the D'Agostino amp, I am loving what I am hearing through my TADs. Yes, this combination is not as truthful as the Dartzeel combo but I can't handle the truth. I want a more musical, i.e. forgiving, presentation. The D'Agostino combo on my TADs is wonderful. Huge, both left to right and top to bottom, sound stage. Layered and in the room presentation to the music. My poorer recordings sound much better, even great. My better recordings are outstanding. I still love my Dartzeel but I am starting to prefer my D'Agostino on my TADs. I will be experimenting with different speakers over the coming months so this is still subject to change. System synergy and personal preference, at this point, is what's important to me. Right or wrong, I am the one who listens to my system and I need to enjoy what I hear.