GR Technologies L66.9C 2.4 vs GR Technologies 67BX
The GR Technologies 67BX has a wider cup diameter.
Mouthpiece A
GR Technologies L66.9C 2.4
• Trumpet
Cup diameter16.99 mm / 0.6689 in
Cup depthDeep
Rim width—
Throat diameter—
Backbore—
Finish—
Material—
Best suited for
Orchestral playing — large cup for full, dark tone
vs
Mouthpiece B
GR Technologies 67BX
• Trumpet
Cup diameter17.00 mm / 0.6693 in
Cup depthDeep
Rim width—
Throat diameter—
Backbore—
Finish—
Material—
Best suited for
Orchestral playing — large cup for full, dark tone
Cup Diameter
The GR Technologies 67BX has a cup diameter of 17.00 mm / 0.6693 in compared to 16.99 mm / 0.6689 in on the GR Technologies L66.9C 2.4 — a difference of 0.01 mm / 0.0004 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
Both mouthpieces share a deep cup depth, so the sound character from depth alone will be very similar.
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.