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Bob Reeves 40/S/69 vs GR Technologies 66M

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

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
Base metal or construction (e.g. brass, stainless steel, plastic). Influences weight, response, and tone color.
Mouthpiece A
    Bob Reeves 40/S/69
    • Trumpet
    Material—
    Best suited for
    🎺Lead / commercial — shallow cup for brightness and range
    vs
    Mouthpiece B
      GR Technologies 66M
      • Trumpet
      Material—

      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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