Bach 18 vs Kelly 24AW
The Bach 18 has a wider cup diameter, the Kelly 24AW features a deeper cup.
Base metal or construction (e.g. brass, stainless steel, plastic). Influences weight, response, and tone color.
Mouthpiece A
Bach 18
• Tuba
Material—
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Kelly 24AW
• Tuba
GeneralMaterialLexan polycarbonate
Best suited for
Orchestral playing — large cup for full, dark tone
Tuba / sousaphone
Material
The Bach 18 is described as unspecified, and the Kelly 24AW 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.