Bach 18 vs Bach 30E
The Bach 18 has a wider cup diameter, the Bach 18 features a deeper cup, the Bach 18 has a larger throat opening.
The narrowest point at the bottom of the cup. Affects resistance, volume, and tone color.
Mouthpiece A
Bach 18
• Tuba
Throat diameter9.00 mm / 0.3543 in
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Bach 30E
• Tuba
Throat diameter8.33 mm / 0.3280 in
Best suited for
High-volume projection — open throat for power
Throat Diameter
The Bach 18 has a wider throat (9.00 mm / 0.3543 in vs 8.33 mm / 0.3280 in). A wider throat allows more air through, increasing volume and projection but reducing resistance.
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.