Bach 30E vs Yamaha BB-66D4
The Yamaha BB-66D4 has a wider cup diameter, the Yamaha BB-66D4 features a deeper cup, the Yamaha BB-66D4 has a larger throat opening.
How deep the cup is, from shallow (brighter, easier high register) to deep (darker, fuller sound).
Mouthpiece A
Bach 30E
• Tuba
Cup depthShallow
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Yamaha BB-66D4
• Tuba
Cup depthDeep
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
Cup Depth
The Yamaha BB-66D4 has a deep cup while the Bach 30E 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.