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Kelly 51D vs Marcinkiewicz 8H-S

The Marcinkiewicz 8H-S has a wider cup diameter, the Kelly 51D features a deeper cup.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
How deep the cup is, from shallow (brighter, easier high register) to deep (darker, fuller sound).
Mouthpiece A
    Kelly 51D
    • Trombone
    Professional
    Cup depth
    Best suited for
    🎻Orchestral playing — large cup for full, dark tone
    📋Professional euphonium and trombone players
    vs
    Mouthpiece B
      Marcinkiewicz 8H-S
      • Trombone
      Cup depthShallow
      Best suited for
      📣High-volume projection — open throat for power

      Cup Depth

      The Kelly 51D has a — cup while the Marcinkiewicz 8H-S has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

      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 Kelly 51D details Marcinkiewicz 8H-S details Kelly 51D equivalents Marcinkiewicz 8H-S equivalents

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