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

The Bach 8½ has a cup diameter of 16.10 mm / 0.6339 in compared to 15.70 mm / 0.6181 in on the Bach 11A — 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 11A and Bach 8½?

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

Bach 11A vs Bach 8½

Name: Bach 8½
Brand: Bach

The Bach 8½ 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 11A

• Cornet

Backbore—

Mouthpiece B

Bach 8½

• 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.