Bach 10½C Flugel vs Bach 10C Flugel
The Bach 10C Flugel has a wider cup diameter.
Mouthpiece A
Bach 10½C Flugel
• Flugelhorn
Cup diameter15.90 mm / 0.6260 in
Cup depthMedium
Rim width—
Throat diameter3.99 mm / 0.1571 in
Backbore—
Finish—
Material—
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Bach 10C Flugel
• Flugelhorn
Cup diameter16.00 mm / 0.6299 in
Cup depthMedium
Rim width—
Throat diameter3.99 mm / 0.1571 in
Backbore—
Finish—
Material—
Best suited for
All-round versatile — balanced cup for general playing
High-volume projection — open throat for power
Cup Diameter
The Bach 10C Flugel has a cup diameter of 16.00 mm / 0.6299 in compared to 15.90 mm / 0.6260 in on the Bach 10½C Flugel — 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
Both mouthpieces share a medium cup depth, so the sound character from depth alone will be very similar.
Throat Diameter
Throat diameters are essentially identical at 3.99 mm / 0.1571 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.