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Bach 6½AL (large shank) vs Kelly 12C

The Bach 6½AL (large shank) has a wider cup diameter, the Bach 6½AL (large shank) features a deeper cup.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
Base metal or construction (e.g. brass, stainless steel, plastic). Influences weight, response, and tone color.
Mouthpiece A
    Bach 6½AL (large shank)
    • Trombone
    Material—
    Best suited for
    🎻Orchestral playing — large cup for full, dark tone
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Kelly 12C
      • Trombone
      Lead
      MaterialLexan polycarbonate
      Best suited for
      📋Lead trombone; smallest cup

      Material

      The Bach 6½AL (large shank) is described as unspecified, and the Kelly 12C 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.

      Open in interactive tool + Add third mouthpiece Bach 6½AL (large shank) details Kelly 12C details Bach 6½AL (large shank) equivalents Kelly 12C equivalents

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