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Bach 12C vs Bach 15C

The Bach 12C has a wider cup diameter.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
The taper behind the throat leading to the shank. Affects projection and tone character.
Mouthpiece A
    Bach 12C
    • Trombone
    Backbore—
    Best suited for
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Bach 15C
      • Trombone
      Backbore—
      Best suited for
      📣High-volume projection — open throat for power

      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 12C details Bach 15C details Bach 12C equivalents Bach 15C equivalents

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