Bach 3C vs GR Technologies 64.7S

The GR Technologies 64.7S has a wider cup diameter, the Bach 3C features a deeper cup.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
    Bach 3C
    • Trumpet
    Cup diameter16.30 mm / 0.6417 in
    Best suited for
    🎵All-round versatile — balanced cup for general playing
    vs
    Mouthpiece B
      GR Technologies 64.7S
      • Trumpet
      Cup diameter16.43 mm / 0.6469 in

      Cup Diameter

      The GR Technologies 64.7S has a cup diameter of 16.43 mm / 0.6469 in compared to 16.30 mm / 0.6417 in on the Bach 3C — a difference of 0.13 mm / 0.0051 in. A wider cup generally produces a fuller, darker tone but requires more air support.

      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 3C details GR Technologies 64.7S details Bach 3C equivalents GR Technologies 64.7S equivalents