Which has a bigger cup — Bach 10 or Bach 10½A?

The Bach 10 has a cup diameter of 16.00 mm / 0.6299 in compared to 15.90 mm / 0.6260 in on the Bach 10½A — a difference of 0.10 mm / 0.0039 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 10 and Bach 10½A?

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

Bach 10 vs Bach 10½A

Name: Bach 10½A
Brand: Bach

The Bach 10 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 10

• Cornet

Finish—

Mouthpiece B

Bach 10½A

• Cornet

Finish—

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.