Bach 8½A vs Yamaha CR-11A4L
The Bach 8½A has a wider cup diameter, the Bach 8½A features a deeper cup, the Bach 8½A has a larger throat opening.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 8½A
• Cornet
Cup diameter16.10 mm / 0.6339 in
vs
Mouthpiece B
Yamaha CR-11A4L
• Cornet
Cup diameter15.99 mm / 0.6295 in
Best suited for
Lead / commercial — shallow cup for brightness and range
Cup Diameter
The Bach 8½A has a cup diameter of 16.10 mm / 0.6339 in compared to 15.99 mm / 0.6295 in on the Yamaha CR-11A4L — a difference of 0.11 mm / 0.0043 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Which is better?
Neither mouthpiece clearly dominates the other — the right choice depends on your embouchure, playing style, and the sound you're after. Try both if possible.