Marcinkiewicz ETU1J. Self vs Yamaha BB-67C4
The Marcinkiewicz ETU1J. Self has a wider cup diameter, the Yamaha BB-67C4 has a larger throat opening.
The narrowest point at the bottom of the cup. Affects resistance, volume, and tone color.
Mouthpiece A
Marcinkiewicz ETU1J. Self
• Tuba
Throat diameter8.03 mm / 0.3161 in
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Yamaha BB-67C4
• Tuba
Throat diameter8.10 mm / 0.3189 in
Best suited for
High-volume projection — open throat for power
Throat Diameter
The Yamaha BB-67C4 has a wider throat (8.10 mm / 0.3189 in vs 8.03 mm / 0.3161 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.