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Marcinkiewicz ET1B. PeeblesBass Shank Only 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
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
    Marcinkiewicz ET1B. PeeblesBass Shank Only
    • Trombone
    Cup diameter26.14 mm / 1.0291 in
    Best suited for
    📣High-volume projection — open throat for power
    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 26.14 mm / 1.0291 in on the Marcinkiewicz ET1B. PeeblesBass Shank Only — a difference of 2.58 mm / 0.1016 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 Marcinkiewicz ET1B. PeeblesBass Shank Only details Yamaha SL-YEO-S details Marcinkiewicz ET1B. PeeblesBass Shank Only equivalents Yamaha SL-YEO-S equivalents

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