Bruno Tilz 213- S 2 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
Bruno Tilz 213- S 2
• Baritone / Euphonium
CatalogCup diameter23.00 mm / 0.9055 in
Best suited for
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 23.00 mm / 0.9055 in on the Bruno Tilz 213- S 2 — a difference of 2.40 mm / 0.0945 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Which is better?
The Bruno Tilz 213- S 2 is designed for catalog playing, while the Kelly 5G-EU-SS targets general use. Your best choice depends on your musical context.