Which has a bigger cup — Bach 12C or Bach 2½C?

The Bach 2½C has a cup diameter of 16.40 mm / 0.6457 in compared to 15.20 mm / 0.5984 in on the Bach 12C — a difference of 1.20 mm / 0.0472 in. A wider cup generally produces a fuller, darker tone but requires more air support.

Bach 12C 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

How deep the cup is, from shallow (brighter, easier high register) to deep (darker, fuller sound).

Mouthpiece A

Bach 12C

• Cornet

Cup depthMedium

Mouthpiece B

Bach 2½C

• Cornet

Cup depthMedium

Best suited for

🎵All-round versatile — balanced cup for general playing

Cup Depth

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

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.