Curry 4C vs Yamaha SL-YEO-S
The Yamaha SL-YEO-S has a wider cup diameter, the Yamaha SL-YEO-S features a deeper cup, the Yamaha SL-YEO-S has a larger throat opening.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Curry 4C
• Trombone
Cup diameter25.73 mm / 1.0130 in
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Yamaha SL-YEO-S
• Trombone
Cup diameter28.72 mm / 1.1307 in
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
Cup Diameter
The Yamaha SL-YEO-S has a cup diameter of 28.72 mm / 1.1307 in compared to 25.73 mm / 1.0130 in on the Curry 4C — a difference of 2.99 mm / 0.1177 in. A wider cup generally produces a fuller, darker tone but requires more air support.
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.