I have a later (N series) Bari. I'm certain this is a 12m, though it isn't marked as such on the back. I have found that if I use my Soloist C* with it, it plays really sharp. I have to pull out almost to the very end of the cork to get it close, but it won't seal pulled out so far. This same mouthpiece worked really well on a YBS-62 I played awhile back. I tried a Gale Companion on it and it played perfectly. This leads me to believe that the smaller chamber of the Soloist is throwing the intonation off. Has this been anyone else's experience?