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Bach 12C vs Bach 4C

The Bach 4C has a wider cup diameter.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
The width of the rim surface that contacts the lips. Wider rims improve endurance; narrower rims improve flexibility.
Mouthpiece A
    Bach 12C
    • Trombone
    Rim width—
    Best suited for
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Bach 4C
      • Trombone
      Rim width—
      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 4C details Bach 12C equivalents Bach 4C equivalents

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