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Bach 30CB vs Schilke 45B

The Bach 30CB has a wider cup diameter, the Bach 30CB features a deeper cup.

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 30CB
    • Trombone
    Cup diameter30.00 mm / 1.1811 in
    Best suited for
    🎻Orchestral playing — large cup for full, dark tone
    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 30CB has a cup diameter of 30.00 mm / 1.1811 in compared to 24.30 mm / 0.9567 in on the Schilke 45B — a difference of 5.70 mm / 0.2244 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 30CB details Schilke 45B details Bach 30CB equivalents Schilke 45B equivalents

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