Which has a bigger cup — Bach 11B or Bach 8½B?

The Bach 8½B has a cup diameter of 16.10 mm / 0.6339 in compared to 15.70 mm / 0.6181 in on the Bach 11B — a difference of 0.40 mm / 0.0157 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 8½B?

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

Bach 11B vs Bach 8½B

Name: Bach 8½B
Brand: Bach

The Bach 8½B has a wider cup diameter.

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

The taper behind the throat leading to the shank. Affects projection and tone character.

Mouthpiece A

Bach 11B

• Cornet

Backbore—

Mouthpiece B

Bach 8½B

• Cornet

Backbore—

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.