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Bach 12C vs Schilke 46D

The Schilke 46D has a wider cup diameter, the Schilke 46D features a deeper cup, the Schilke 46D 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 12C
    • Trombone
    Cup diameter24.50 mm / 0.9646 in
    Best suited for
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Schilke 46D
      • Trombone
      Cup diameter24.76 mm / 0.9748 in
      Best suited for
      📣High-volume projection — open throat for power

      Cup Diameter

      The Schilke 46D has a cup diameter of 24.76 mm / 0.9748 in compared to 24.50 mm / 0.9646 in on the Bach 12C — a difference of 0.26 mm / 0.0102 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 12C details Schilke 46D details Bach 12C equivalents Schilke 46D equivalents

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