I have read quite a few players who have commented that their endurance is substancially less when playing their large bore Conn Concert Grands. I think the horn resonates pretty easily and can be played at a low dynamics pretty easily. I think the horn has more projection and gives less local feedback and it doesn't break into that sizzle tone without some effort. I was thinkng that this was more of the reason players experience endurance issues more than the bore size. thoughts?