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Bach 3 vs Yamaha SL-YEO-S

The Yamaha SL-YEO-S has a wider cup diameter, 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 3
    • Trombone
    Cup diameter26.26 mm / 1.0339 in
    Cup depthDeep
    Rim width—
    Throat diameter5.85 mm / 0.2303 in
    Backbore—
    Finish—
    Material—
    Best suited for
    🎻Orchestral playing — large cup for full, dark tone
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Yamaha SL-YEO-S
      • Trombone
      Cup diameter28.72 mm / 1.1307 in
      Cup depthDeep
      Rim width—
      Throat diameter8.00 mm / 0.3150 in
      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 / 1.1307 in compared to 26.26 mm / 1.0339 in on the Bach 3 — a difference of 2.46 mm / 0.0969 in. A wider cup generally produces a fuller, darker tone but requires more air support.

      Cup Depth

      Both mouthpieces share a deep cup depth, so the sound character from depth alone will be very similar.

      Throat Diameter

      The Yamaha SL-YEO-S has a wider throat (8.00 mm / 0.3150 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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