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Bob Reeves 11C vs Schilke 45B

The Bob Reeves 11C has a wider cup diameter, the Schilke 45B features a deeper cup.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
Mouthpiece A
    Bob Reeves 11C
    • Trombone
    Cup diameter24.80 mm / 0.9764 in
    Cup depthShallow
    Rim width—
    Throat diameter—
    Backbore—
    Finish—
    Material—
    vs
    Mouthpiece B
      Schilke 45B
      • Trombone
      Cup diameter24.30 mm / 0.9567 in
      Cup depthMedium
      Rim width—
      Throat diameter5.95 mm / 0.2343 in
      Backbore15/64 .2344"
      Finish—
      Material—
      Best suited for
      📣High-volume projection — open throat for power

      Cup Diameter

      The Bob Reeves 11C has a cup diameter of 24.80 mm / 0.9764 in compared to 24.30 mm / 0.9567 in on the Schilke 45B — a difference of 0.50 mm / 0.0197 in. A wider cup generally produces a fuller, darker tone but requires more air support.

      Cup Depth

      The Schilke 45B has a medium cup while the Bob Reeves 11C 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 Bob Reeves 11C details Schilke 45B details Bob Reeves 11C equivalents Schilke 45B equivalents

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