Bach 12 vs Bach 12B
the Bach 12 features a deeper cup.
How deep the cup is, from shallow (brighter, easier high register) to deep (darker, fuller sound).
Mouthpiece A
Bach 12
• Cornet
Cup depthVery deep
vs
Mouthpiece B
Bach 12B
• Cornet
Cup depthDeep
Cup Depth
The Bach 12 has a very deep cup while the Bach 12B has a deep 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.