need more smoothness

Some of the smoothest sounding speakers available use metal tweeters. All metal does not resonate at the same frequency. Metal can be treated to alter its resonate characteristics. etc etc.

You really need to list your entire system. Also a detailed description of your listening room and placement would help.

B&W's can sound wonderfully smooth with the right gear. Every link in the chain matters with B&W's. That said, there are smoother sounding speakers available, many of which aren't as demanding of the upstream components.

It isn't the same with all music, piano for example is
great, but their analytical caracter shows too much detail
at the high tones for me, that's why you hear almost everything, it's also a matter of personal taste.

I use a Rotel 971 MK2 amp (60 W), NAD C 520 player, and use QED cable and wire with my B&W's. My room is about 5 x 5 m.
I use the word sharp, but that's not 100 % correct, maybe
hard is a better discription.

Joekras, where did you exactly found that about the stick felt at B&W website? I was not able to find anything about it. Thanks.

I own the CDM-1nt's. This is what I've found:
I don't know how long yours have been broken in, but mine seemed to take ~3-5 months. At first they were shrill and bright, presently they are smooth and warm. My wife noticed the difference.

I tried felt and this seemed to work but not as much as I would have liked. The big difference for me was:
1) Moving the speakers further apart ~8 feet and using less tow in. This made a unmistakeable difference.
2) Changing the power cord on my Rotel RA-1070 int. amp to Volex 17604, 14 gauge/shielded (cheap ~ $5.00 thru Newark.com). I plugged the cord directly into the outlet bypassing the surge protector. This was not insignificant it was HUGE! (I was not a believer in power cords). The sound became warmer, bigger, and the bass is now much deeper. I then changed the cord on my CD with the same cord, bought two. This helped as well but not as much as on the amp.

Hope this helps.