Giardinelli 4M vs Yamaha EP-51DS
The Giardinelli 4M has a wider cup diameter, the Yamaha EP-51DS features a deeper cup, the Yamaha EP-51DS has a larger throat opening.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Giardinelli 4M
• Baritone / Euphonium
Cup diameter25.40 mm / 1.0000 in
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Yamaha EP-51DS
• Baritone / Euphonium
Cup diameter25.24 mm / 0.9937 in
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
Cup Diameter
The Giardinelli 4M has a cup diameter of 25.40 mm / 1.0000 in compared to 25.24 mm / 0.9937 in on the Yamaha EP-51DS — a difference of 0.16 mm / 0.0063 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.