GR Technologies Primal 62 vs Yamaha TR-14B4
The Yamaha TR-14B4 has a wider cup diameter, the GR Technologies Primal 62 features a deeper cup.
Mouthpiece A
GR Technologies Primal 62
• Trumpet
Cup diameter15.75 mm / 0.6201 in
Cup depthMedium
Rim width—
Throat diameter—
Backbore—
Finish—
Material—
vs
Mouthpiece B
Yamaha TR-14B4
• Trumpet
Cup diameter16.85 mm / 0.6634 in
Cup depthShallow
Rim width—
Throat diameter3.65 mm / 0.1437 in
BackboreSemi-narrow
Finish—
Material—
Cup Diameter
The Yamaha TR-14B4 has a cup diameter of 16.85 mm / 0.6634 in compared to 15.75 mm / 0.6201 in on the GR Technologies Primal 62 — a difference of 1.10 mm / 0.0433 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The GR Technologies Primal 62 has a medium cup while the Yamaha TR-14B4 has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
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.