Which has a bigger cup — Bach 11B or Bach 9B?

The Bach 9B has a cup diameter of 16.05 mm / 0.6319 in compared to 15.70 mm / 0.6181 in on the Bach 11B — a difference of 0.35 mm / 0.0138 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 11B and Bach 9B?

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

Bach 11B vs Bach 9B

Name: Bach 9B
Brand: Bach

The Bach 9B has a wider cup diameter.

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

Base metal or construction (e.g. brass, stainless steel, plastic). Influences weight, response, and tone color.

Mouthpiece A

Bach 11B

• Cornet

Material—

Mouthpiece B

Bach 9B

• Cornet

Material—

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.