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Bach 12C vs Curry 11S

The Bach 12C has a wider cup diameter, the Curry 11S has a larger throat opening.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
Mouthpiece A
    Bach 12C
    • Trombone
    Cup diameter24.50 mm / 0.9646 in
    Cup depthShallow
    Rim width—
    Throat diameter5.85 mm / 0.2303 in
    Backbore—
    Finish—
    Material—
    Best suited for
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Curry 11S
      • Trombone
      Cup diameter24.49 mm / 0.9640 in
      Cup depthShallow
      Rim width—
      Throat diameter6.02 mm / 0.2370 in
      Backbore—
      Finish—
      Material—
      Best suited for
      📣High-volume projection — open throat for power

      Cup Diameter

      The Bach 12C has a cup diameter of 24.50 mm / 0.9646 in compared to 24.49 mm / 0.9640 in on the Curry 11S — a difference of 0.01 mm / 0.0006 in. A wider cup generally produces a fuller, darker tone but requires more air support.

      Cup Depth

      Both mouthpieces share a shallow cup depth, so the sound character from depth alone will be very similar.

      Throat Diameter

      The Curry 11S has a wider throat (6.02 mm / 0.2370 in vs 5.85 mm / 0.2303 in). A wider throat allows more air through, increasing volume and projection but reducing resistance.

      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 Curry 11S details Bach 12C equivalents Curry 11S equivalents

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