Home › Trombone › Bach 12C vs Schilke 40B

Bach 12C vs Schilke 40B

The Bach 12C has a wider cup diameter, the Schilke 40B 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 40B
      • Trombone
      Cup diameter22.51 mm / 0.8862 in
      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 22.51 mm / 0.8862 in on the Schilke 40B — a difference of 1.99 mm / 0.0783 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 40B details Bach 12C equivalents Schilke 40B equivalents

      Compare Bach 12C with others

      Compare Schilke 40B with others

      Popular Trombone comparisons

      Bach vs Schilke

      Browse by specification