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Bach 18 vs Curry 12C

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

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
    Bach 18
    • Trombone
    Cup diameter24.20 mm / 0.9528 in
    Best suited for
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Curry 12C
      • Trombone
      Cup diameter24.23 mm / 0.9540 in
      Best suited for
      📣High-volume projection — open throat for power

      Cup Diameter

      The Curry 12C has a cup diameter of 24.23 mm / 0.9540 in compared to 24.20 mm / 0.9528 in on the Bach 18 — a difference of 0.03 mm / 0.0012 in. A wider cup generally produces a fuller, darker tone but requires more air support.

      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 18 details Curry 12C details Bach 18 equivalents Curry 12C equivalents

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