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Bach 12E vs Schilke 51B

The Schilke 51B has a wider cup diameter, the Schilke 51B features a deeper cup, the Schilke 51B has a larger throat opening.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
Mouthpiece A
    Bach 12E
    • Trombone
    Cup diameter24.50 mm / 0.9646 in
    Cup depthShallow
    Rim width—
    Throat diameter5.85 mm / 0.2303 in
    Backbore—
    Finish—
    Material—
    Best suited for
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Schilke 51B
      • Trombone
      Cup diameter25.63 mm / 1.0091 in
      Cup depthMedium
      Rim width—
      Throat diameter6.53 mm / 0.2571 in
      BackboreF .257"
      Finish—
      Material—
      Best suited for
      📣High-volume projection — open throat for power

      Cup Diameter

      The Schilke 51B has a cup diameter of 25.63 mm / 1.0091 in compared to 24.50 mm / 0.9646 in on the Bach 12E — a difference of 1.13 mm / 0.0445 in. A wider cup generally produces a fuller, darker tone but requires more air support.

      Cup Depth

      The Schilke 51B has a medium cup while the Bach 12E has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

      Throat Diameter

      The Schilke 51B has a wider throat (6.53 mm / 0.2571 in vs 5.85 mm / 0.2303 in). A wider throat allows more air through, increasing volume and projection but reducing resistance.

      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.

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