Bach 1¼G vs Kelly 5G-LS
The Bach 1¼G has a wider cup diameter, the Kelly 5G-LS features a deeper cup.
Base metal or construction (e.g. brass, stainless steel, plastic). Influences weight, response, and tone color.
Mouthpiece A
Bach 1¼G
• Trombone
Material—
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
vs
Mouthpiece B
Kelly 5G-LS
• Trombone
OrchestralMaterialLexan polycarbonate
Best suited for
Orchestral playing — large cup for full, dark tone
Symphonic trombone / euphonium
Material
The Bach 1¼G is described as unspecified, and the Kelly 5G-LS 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.