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Bach 12C vs Schilke 47

The Schilke 47 has a wider cup diameter, the Schilke 47 features a deeper cup, the Schilke 47 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 47
      • Trombone
      Cup diameter24.99 mm / 0.9839 in
      Best suited for
      📣High-volume projection — open throat for power

      Cup Diameter

      The Schilke 47 has a cup diameter of 24.99 mm / 0.9839 in compared to 24.50 mm / 0.9646 in on the Bach 12C — a difference of 0.49 mm / 0.0193 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.

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