Bach 10½C vs Yamaha TR-11B4-GP
The Yamaha TR-11B4-GP has a wider cup diameter, the Bach 10½C features a deeper cup, the Bach 10½C has a larger throat opening.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 10½C
• Trumpet
Cup diameter15.90 mm / 0.6260 in
vs
Mouthpiece B
Yamaha TR-11B4-GP
• Trumpet
Cup diameter16.46 mm / 0.6480 in
Cup Diameter
The Yamaha TR-11B4-GP has a cup diameter of 16.46 mm / 0.6480 in compared to 15.90 mm / 0.6260 in on the Bach 10½C — a difference of 0.56 mm / 0.0220 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.