Giardinelli 5D vs Kelly 5G-EU-SS
The Kelly 5G-EU-SS has a wider cup diameter, the Kelly 5G-EU-SS features a deeper cup.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Giardinelli 5D
• Baritone / Euphonium
Cup diameter25.00 mm / 0.9843 in
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
vs
Mouthpiece B
Kelly 5G-EU-SS
• Baritone / Euphonium
GeneralCup diameter25.40 mm / 1.0000 in
Best suited for
Orchestral playing — large cup for full, dark tone
Euphonium general use
Cup Diameter
The Kelly 5G-EU-SS has a cup diameter of 25.40 mm / 1.0000 in compared to 25.00 mm / 0.9843 in on the Giardinelli 5D — a difference of 0.40 mm / 0.0157 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.