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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
Mouthpiece A
    Marcinkiewicz ET1B. PeeblesBass Shank Only
    • Trombone
    Cup diameter26.14 mm / 1.0291 in
    Cup depthVery shallow
    Rim width—
    Throat diameter6.76 mm / 0.2661 in
    Backbore—
    Finish—
    Material—
    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
      Cup depthMedium
      Rim width—
      Throat diameter6.62 mm / 0.2606 in
      BackboreSemi-narrow
      Finish—
      Material—
      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.

      Cup Depth

      The Yamaha SL-48L-GP has a medium cup while the Marcinkiewicz ET1B. PeeblesBass Shank Only has a very shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

      Throat Diameter

      The Marcinkiewicz ET1B. PeeblesBass Shank Only has a wider throat (6.76 mm / 0.2661 in vs 6.62 mm / 0.2606 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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