Which has a bigger cup — Bach 11½A or Bach 11A?

The Bach 11A has a cup diameter of 15.70 mm / 0.6181 in compared to 15.65 mm / 0.6161 in on the Bach 11½A — a difference of 0.05 mm / 0.0020 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 11½A and Bach 11A?

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

Bach 11½A vs Bach 11A

Name: Bach 11A
Brand: Bach

The Bach 11A has a wider cup diameter.

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

The narrowest point at the bottom of the cup. Affects resistance, volume, and tone color.

Mouthpiece A

Bach 11½A

• Cornet

Throat diameter3.66 mm / 0.1441 in

Mouthpiece B

Bach 11A

• Cornet

Throat diameter3.66 mm / 0.1441 in

Throat Diameter

Throat diameters are essentially identical at 3.66 mm / 0.1441 in, so resistance feel will be comparable.

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.