Bach 12E vs Bach 6½AM (large shank)
The Bach 6½AM (large shank) has a wider cup diameter, the Bach 6½AM (large shank) features a deeper cup, the Bach 6½AM (large shank) has a larger throat opening.
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 6½AM (large shank)
• Trombone
Cup depthDeep
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
Cup Depth
The Bach 6½AM (large shank) has a 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.