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Bach 15C vs Schilke 45B

The Bach 15C has a wider cup diameter, the Schilke 45B features a deeper cup, the Schilke 45B has a larger throat opening.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
How deep the cup is, from shallow (brighter, easier high register) to deep (darker, fuller sound).
Mouthpiece A
    Bach 15C
    • Trombone
    Cup depthShallow
    Best suited for
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Schilke 45B
      • Trombone
      Cup depthMedium
      Best suited for
      📣High-volume projection — open throat for power

      Cup Depth

      The Schilke 45B has a medium cup while the Bach 15C has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

      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 15C details Schilke 45B details Bach 15C equivalents Schilke 45B equivalents

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