Which has a bigger cup — Bach 11½C or Bach 12C?

The Bach 11½C has a cup diameter of 15.65 mm / 0.6161 in compared to 15.20 mm / 0.5984 in on the Bach 12C — a difference of 0.45 mm / 0.0177 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 11½C and Bach 12C?

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

Bach 11½C vs Bach 12C

Name: Bach 12C
Brand: Bach

The Bach 11½C 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 11½C

• Cornet

Finish—

Mouthpiece B

Bach 12C

• Cornet

Finish—

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.