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Schilke 40B vs Schilke 43A

The Schilke 43A has a wider cup diameter, the Schilke 43A features a deeper cup.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
Mouthpiece A
    Schilke 40B
    • Trombone
    Cup diameter22.51 mm / 0.8862 in
    Cup depthShallow
    Rim width—
    Throat diameter5.95 mm / 0.2343 in
    Backbore15/64 .2344"
    Finish—
    Material—
    Best suited for
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Schilke 43A
      • Trombone
      Cup diameter23.57 mm / 0.9280 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 Schilke 43A has a cup diameter of 23.57 mm / 0.9280 in compared to 22.51 mm / 0.8862 in on the Schilke 40B — a difference of 1.06 mm / 0.0417 in. A wider cup generally produces a fuller, darker tone but requires more air support.

      Cup Depth

      The Schilke 43A has a medium cup while the Schilke 40B has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

      Throat Diameter

      Throat diameters are essentially identical at 5.95 mm / 0.2343 in, so resistance feel will be comparable.

      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 Schilke 40B details Schilke 43A details Schilke 40B equivalents Schilke 43A equivalents

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