Bach 1B vs Yamaha CR-16ES-GP
The Yamaha CR-16ES-GP has a wider cup diameter, the Yamaha CR-16ES-GP features a deeper cup, the Yamaha CR-16ES-GP has a larger throat opening.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 1B
• Cornet
Cup diameter17.00 mm / 0.6693 in
Best suited for
Orchestral playing — large cup for full, dark tone
vs
Mouthpiece B
Yamaha CR-16ES-GP
• Cornet
Cup diameter17.05 mm / 0.6713 in
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
Cup Diameter
The Yamaha CR-16ES-GP has a cup diameter of 17.05 mm / 0.6713 in compared to 17.00 mm / 0.6693 in on the Bach 1B — a difference of 0.05 mm / 0.0020 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.