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Kelly 12C vs Marcinkiewicz 8H-S

The Marcinkiewicz 8H-S has a wider cup diameter.

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 12C
    • Trombone
    Lead
    Cup depthShallow
    Best suited for
    📋Lead trombone; smallest cup
    vs
    Mouthpiece B
      Marcinkiewicz 8H-S
      • Trombone
      Cup depthShallow
      Best suited for
      📣High-volume projection — open throat for power

      Cup Depth

      Both mouthpieces share a shallow cup depth, so the sound character from depth alone will be very similar.

      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 12C details Marcinkiewicz 8H-S details Kelly 12C equivalents Marcinkiewicz 8H-S equivalents

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