GR Technologies 63S vs Schilke 14A4
The Schilke 14A4 has a wider cup diameter, the Schilke 14A4 features a deeper cup.
Mouthpiece A
GR Technologies 63S
• Trumpet
Cup diameter16.00 mm / 0.6299 in
Cup depthShallow
Rim width—
Throat diameter—
Backbore—
Finish—
Material—
Best suited for
Lead / commercial — shallow cup for brightness and range
vs
Mouthpiece B
Schilke 14A4
• Trumpet
Cup diameter17.09 mm / 0.6728 in
Cup depthMedium
Rim width—
Throat diameter3.66 mm / 0.1441 in
Backbore27
Finish—
Material—
Cup Diameter
The Schilke 14A4 has a cup diameter of 17.09 mm / 0.6728 in compared to 16.00 mm / 0.6299 in on the GR Technologies 63S — a difference of 1.09 mm / 0.0429 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Schilke 14A4 has a medium cup while the GR Technologies 63S 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.