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Bob Reeves 4G-5G vs Yamaha SL-YEO-S

The Yamaha SL-YEO-S has a wider cup diameter.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
    Bob Reeves 4G-5G
    • Trombone
    Cup diameter26.00 mm / 1.0236 in
    Best suited for
    🎻Orchestral playing — large cup for full, dark tone
    vs
    Mouthpiece B
      Yamaha SL-YEO-S
      • Trombone
      Cup diameter28.72 mm / 1.1307 in
      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 26.00 mm / 1.0236 in on the Bob Reeves 4G-5G — a difference of 2.72 mm / 0.1071 in. A wider cup generally produces a fuller, darker tone but requires more air support.

      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 Bob Reeves 4G-5G details Yamaha SL-YEO-S details Bob Reeves 4G-5G equivalents Yamaha SL-YEO-S equivalents

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