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Bach 12C vs Bach 18

The Bach 12C has a wider cup diameter, the Bach 18 features a deeper cup.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
How deep the cup is, from shallow (brighter, easier high register) to deep (darker, fuller sound).
Mouthpiece A
    Bach 12C
    • Trombone
    Cup depthShallow
    Best suited for
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Bach 18
      • Trombone
      Cup depthMedium
      Best suited for
      📣High-volume projection — open throat for power

      Cup Depth

      The Bach 18 has a medium cup while the Bach 12C has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

      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 18 details Bach 12C equivalents Bach 18 equivalents

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