Which has a bigger cup — Bach 10½C or Bach 6C?

The Bach 6C has a cup diameter of 16.20 mm / 0.6378 in compared to 15.90 mm / 0.6260 in on the Bach 10½C — a difference of 0.30 mm / 0.0118 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 10½C and Bach 6C?

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

Bach 10½C vs Bach 6C

Name: Bach 6C
Brand: Bach

The Bach 6C 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 10½C

• Cornet

Finish—

Mouthpiece B

Bach 6C

• 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.