Bach 12E vs Bach 30CB
The Bach 30CB has a wider cup diameter, the Bach 30CB features a deeper cup.
How deep the cup is, from shallow (brighter, easier high register) to deep (darker, fuller sound).
Mouthpiece A
Bach 12E
• Trombone
Cup depthShallow
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Bach 30CB
• Trombone
Cup depthVery deep
Best suited for
Orchestral playing — large cup for full, dark tone
Cup Depth
The Bach 30CB has a very deep cup while the Bach 12E has a shallow 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.