Which has a bigger cup — Bach 11C or Bach 2½C?

The Bach 2½C has a cup diameter of 16.40 mm / 0.6457 in compared to 15.70 mm / 0.6181 in on the Bach 11C — a difference of 0.70 mm / 0.0276 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 11C and Bach 2½C?

Both mouthpieces share a medium cup depth, so the sound character from depth alone will be very similar.

Bach 11C vs Bach 2½C

Name: Bach 2½C
Brand: Bach

The Bach 2½C has a wider cup diameter.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material

Surface plating or treatment (e.g. silver plate, gold trim). Affects feel, durability, and appearance.

Mouthpiece A

Bach 11C

• Cornet

Finish—

Mouthpiece B

Bach 2½C

• Cornet

Finish—

Best suited for

🎵All-round versatile — balanced cup for general playing

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.