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GR Technologies 66M vs Marcinkiewicz CH 13

The GR Technologies 66M has a wider cup diameter, the Marcinkiewicz CH 13 features a deeper cup.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
The width of the rim surface that contacts the lips. Wider rims improve endurance; narrower rims improve flexibility.
Mouthpiece A
    GR Technologies 66M
    • Trumpet
    Rim width—
    vs
    Mouthpiece B
      Marcinkiewicz CH 13
      • Trumpet
      Rim width—

      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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