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Conn Precision 2 vs Yamaha SL-YEO-S

Both mouthpieces share similar core dimensions — the differences are in the details.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
Mouthpiece A
    Conn Precision 2
    • Trombone
    Lead
    Cup diameter—
    Cup depthDeep
    Rim width—
    Throat diameter—
    Backbore—
    Finish—
    MaterialSilver-plated brass
    Best suited for
    📋Solo work; high register; bright
    🎶Big bright tone; excellent solo
    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 Depth

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

      Material

      The Conn Precision 2 is described as Silver-plated brass, and the Yamaha SL-YEO-S as unspecified. Material affects mass, warmth, and how quickly the piece responds.

      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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