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

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 narrowest point at the bottom of the cup. Affects resistance, volume, and tone color.
Mouthpiece A
    GR Technologies X66.8 C*
    • Trumpet
    Throat diameter—
    Best suited for
    🎻Orchestral playing — large cup for full, dark tone
    vs
    Mouthpiece B
      Yamaha TR-14B4
      • Trumpet
      Throat diameter3.65 mm / 0.1437 in

      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

      Compare GR Technologies X66.8 C* with others

      Compare Yamaha TR-14B4 with others

      Popular Trumpet comparisons

      GR Technologies vs Yamaha

      Browse by specification