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Marcinkiewicz ET1B. PeeblesBass Shank Only vs Yamaha SL-48L-GP

The Marcinkiewicz ET1B. PeeblesBass Shank Only has a wider cup diameter, the Yamaha SL-48L-GP features a deeper cup, the Marcinkiewicz ET1B. PeeblesBass Shank Only 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-48L-GP
      • Trombone
      Cup diameter25.25 mm / 0.9941 in
      Best suited for
      📣High-volume projection — open throat for power

      Cup Diameter

      The Marcinkiewicz ET1B. PeeblesBass Shank Only has a cup diameter of 26.14 mm / 1.0291 in compared to 25.25 mm / 0.9941 in on the Yamaha SL-48L-GP — a difference of 0.89 mm / 0.0350 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-48L-GP details Marcinkiewicz ET1B. PeeblesBass Shank Only equivalents Yamaha SL-48L-GP equivalents

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