A
Great all round mouthpiece
I'm surprised this mouthpiece is not better known and more widely used - fairly close to a 7C diameter but for me a more comfortable, less sharp rim. The 9D is definitely NOT a very shallow cup, I would say slightly deeper than the close equivalent Yamaha 11B4. The cup also has a slight V shape to it, a bit of a V/C hybrid. I also have the 9C and that is really quite deep, more than I was expecting. Deserves to be better known in the Bach catalogue.
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Jelentem!
B
In a Word Average.
Not as good as the older BACH Mouthpieces.
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