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GR Technologies X66.8 C* vs Yamaha TR-14B4

The GR Technologies X66.8 C* has a wider cup diameter, the GR Technologies X66.8 C* 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 X66.8 C*
    • Trumpet
    Rim width—
    Best suited for
    🎻Orchestral playing — large cup for full, dark tone
    vs
    Mouthpiece B
      Yamaha TR-14B4
      • 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.

      Open in interactive tool + Add third mouthpiece GR Technologies X66.8 C* details Yamaha TR-14B4 details GR Technologies X66.8 C* equivalents Yamaha TR-14B4 equivalents

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