Which has a bigger cup — Bach 10½C or Bach 8½A?

The Bach 8½A has a cup diameter of 16.10 mm / 0.6339 in compared to 15.90 mm / 0.6260 in on the Bach 10½C — a difference of 0.20 mm / 0.0079 in. A wider cup generally produces a fuller, darker tone but requires more air support.

Bach 10½C vs Bach 8½A

Name: Bach 8½A
Brand: Bach

The Bach 8½A has a wider cup diameter, the Bach 8½A features a deeper cup.

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

How deep the cup is, from shallow (brighter, easier high register) to deep (darker, fuller sound).

Mouthpiece A

Bach 10½C

• Cornet

Cup depthMedium

Mouthpiece B

Bach 8½A

• Cornet

Cup depthVery deep

Cup Depth

The Bach 8½A has a very deep cup while the Bach 10½C has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

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.