Denis Wick 6BY vs Kelly 5G-EU
the Kelly 5G-EU features a deeper cup.
Mouthpiece A
Denis Wick 6BY
• Baritone / Euphonium
Cup diameter25.40 mm
Cup depthMedium
Rim width6.26 mm
Throat diameter7.12 mm
Backboremedium
Finish—
Material—
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Kelly 5G-EU
• Baritone / Euphonium
GeneralCup diameter25.40 mm
Cup depth
Rim width—
Throat diameter—
BackboreL
Finish—
MaterialLexan polycarbonate
Best suited for
Orchestral playing — large cup for full, dark tone
Euphonium general use
Cup Diameter
Both mouthpieces have virtually identical cup diameters at 25.40 mm.
Cup Depth
The Kelly 5G-EU has a — cup while the Denis Wick 6BY has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Material
The Denis Wick 6BY is described as unspecified, and the Kelly 5G-EU as Lexan polycarbonate. Material affects mass, warmth, and how quickly the piece responds.
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.