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Bach 12E vs Yamaha SL-YEO-S

The Yamaha SL-YEO-S has a wider cup diameter, the Yamaha SL-YEO-S features a deeper cup, the Yamaha SL-YEO-S 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
    Cup depthShallow
    Rim width—
    Throat diameter5.85 mm
    Backbore—
    Finish—
    Material—
    Best suited for
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Yamaha SL-YEO-S
      • Trombone
      Cup diameter28.72 mm
      Cup depthDeep
      Rim width—
      Throat diameter8.00 mm
      BackboreSemi-wide
      Finish—
      Material—
      Best suited for
      🎻Orchestral playing — large cup for full, dark tone
      📣High-volume projection — open throat for power

      Cup Diameter

      The Yamaha SL-YEO-S has a cup diameter of 28.72 mm compared to 24.50 mm on the Bach 12E — a difference of +4.22 mm. A wider cup generally produces a fuller, darker tone but requires more air support.

      Cup Depth

      The Yamaha SL-YEO-S has a deep 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 Yamaha SL-YEO-S has a wider throat (8.00 mm vs 5.85 mm). 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 Yamaha SL-YEO-S details Bach 12E equivalents Yamaha SL-YEO-S equivalents

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