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Bach 12E vs Marcinkiewicz 9BB. Stroup

The Marcinkiewicz 9BB. Stroup has a wider cup diameter, the Bach 12E features a deeper cup, the Marcinkiewicz 9BB. Stroup has a larger throat opening.

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
    Bach 12E
    • Trombone
    Cup depthShallow
    Best suited for
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Marcinkiewicz 9BB. Stroup
      • Trombone
      Cup depthVery shallow
      Best suited for
      📣High-volume projection — open throat for power

      Cup Depth

      The Bach 12E has a shallow cup while the Marcinkiewicz 9BB. Stroup has a very 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 Bach 12E details Marcinkiewicz 9BB. Stroup details Bach 12E equivalents Marcinkiewicz 9BB. Stroup equivalents

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