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Bach 12E vs Schilke 42B

The Bach 12E has a wider cup diameter, the Schilke 42B features a deeper cup, the Schilke 42B has a larger throat opening.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
The narrowest point at the bottom of the cup. Affects resistance, volume, and tone color.
Mouthpiece A
    Bach 12E
    • Trombone
    Throat diameter5.85 mm / 0.2303 in
    Best suited for
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Schilke 42B
      • Trombone
      Throat diameter5.95 mm / 0.2343 in
      Best suited for
      📣High-volume projection — open throat for power

      Throat Diameter

      The Schilke 42B has a wider throat (5.95 mm / 0.2343 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.

      Open in interactive tool + Add third mouthpiece Bach 12E details Schilke 42B details Bach 12E equivalents Schilke 42B equivalents

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