Bach 15 vs Kelly 5G-EU-SS
The Kelly 5G-EU-SS has a wider cup diameter, the Kelly 5G-EU-SS features a deeper cup.
How deep the cup is, from shallow (brighter, easier high register) to deep (darker, fuller sound).
Mouthpiece A
Bach 15
• Baritone / Euphonium
Cup depthDeep
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 depth
Best suited for
Orchestral playing — large cup for full, dark tone
Euphonium general use
Cup Depth
The Kelly 5G-EU-SS has a — cup while the Bach 15 has a deep cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
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.