Bach 17C vs Bach 18
the Bach 18 features a deeper cup.
How deep the cup is, from shallow (brighter, easier high register) to deep (darker, fuller sound).
Mouthpiece A
Bach 17C
• Cornet
Cup depthMedium
vs
Mouthpiece B
Bach 18
• Cornet
Cup depthVery deep
Cup Depth
The Bach 18 has a very deep cup while the Bach 17C 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.