Denis Wick 6BM vs Kelly 51D-EU-SS
the Kelly 51D-EU-SS features a deeper cup.
Mouthpiece A
Denis Wick 6BM
• Baritone / Euphonium
Cup diameter25.40 mm / 1.0000 in
Cup depthMedium
Rim width6.26 mm / 0.2465 in
Throat diameter7.12 mm / 0.2803 in
Backboremedium
Finish—
Material—
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Kelly 51D-EU-SS
• Baritone / Euphonium
ProfessionalCup diameter25.40 mm / 1.0000 in
Cup depth
Rim width—
Throat diameter—
BackboreL
Finish—
Material316 Surgical Stainless Steel
Best suited for
Orchestral playing — large cup for full, dark tone
Professional euphonium
Cup Diameter
Both mouthpieces have virtually identical cup diameters at 25.40 mm / 1.0000 in.
Cup Depth
The Kelly 51D-EU-SS has a — cup while the Denis Wick 6BM has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Material
The Denis Wick 6BM is described as unspecified, and the Kelly 51D-EU-SS as 316 Surgical Stainless Steel. 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.