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Bach 15CW vs Schilke 45B

The Bach 15CW 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
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
    Bach 15CW
    • Trombone
    Cup diameter24.40 mm / 0.9606 in
    Best suited for
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Schilke 45B
      • Trombone
      Cup diameter24.30 mm / 0.9567 in
      Best suited for
      📣High-volume projection — open throat for power

      Cup Diameter

      The Bach 15CW has a cup diameter of 24.40 mm / 0.9606 in compared to 24.30 mm / 0.9567 in on the Schilke 45B — a difference of 0.10 mm / 0.0039 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 15CW details Schilke 45B details Bach 15CW equivalents Schilke 45B equivalents

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