@jc51373
I wouldn't characterize the AMT tweeters in the models above the Cantabile as bright per se like I would the Be tweeters. They are very extended but without the hint of natural warmth the silk domes impart. This just requires careful matching with the front end gear and careful placement in the room with particular attention paid to rake angle and distance from seating position to speaker. If you can get them at least a couple of feet off of the wall behind them(more is better) and around 8' apart center to center then that is a good starting point I think they work best without a doubt with tubes in the amplification chain somewhere and Bob generally ran all of his various models with the hybrid Blue Circle gear or on occasion with Audio Note tube gear. When in the main system I had the best luck with a Supratek preamp and the Kinki Studio EX-B7 or Odyssey Kismet Reference amps. Some times during the Winter months I would swap the SS amps for an EL-34 based tube amps which would warm them up a bit more. As my main system was always in a dedicated room I was able to play around with both the speaker and seating position until I found the sweet spot but if you situation is different and your seating position is locked in the you will have to play with the speaker positioning to lock them in. A big part of this with the AMT tweeter more so than with the silk dome even is getting the rake angle right based on your seating height. As a long time Vandersteen owner over the years this was a critical part of their set up procedure so not something novel to me in setting up the Abscisse's. In the end if you pay attention to the gear, speaker positioning and seating placement you can make them sound spectacular and they will have plenty of bass compared to the Cantabile. They will not however even at their best have that same "soul factor" as either the Cantabile or the Bliss as the Abscisse is the sole creation of Jean Claude Reynaud while the other two were Jean Marie's original creations. While Jean Claude's designs have in some ways started to lean more towards the voicings of his fathers designs you still have the differences that exist between the ear of a trained pianist versus the ear of a recording engineer. If you are happy with the overall "feel" of the Cantabile have you given any thought to maybe just adding a pair of small sealed subs or will that not work in your setting? Feel free to reach out if I can help you any further.