Bach 10 vs Bach 10½C
The Bach 10 has a wider cup diameter, the Bach 10 features a deeper cup.
Mouthpiece A
Bach 10
• Cornet
Cup diameter16.00 mm / 0.6299 in
Cup depthVery deep
Rim width—
Throat diameter3.66 mm / 0.1441 in
Backbore—
Finish—
Material—
vs
Mouthpiece B
Bach 10½C
• Cornet
Cup diameter15.90 mm / 0.6260 in
Cup depthMedium
Rim width—
Throat diameter3.66 mm / 0.1441 in
Backbore—
Finish—
Material—
Cup Diameter
The Bach 10 has a cup diameter of 16.00 mm / 0.6299 in compared to 15.90 mm / 0.6260 in on the Bach 10½C — a difference of 0.10 mm / 0.0039 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Bach 10 has a very deep cup while the Bach 10½C has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
Throat diameters are essentially identical at 3.66 mm / 0.1441 in, so resistance feel will be comparable.
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.