Bach 1¼C vs GR Technologies 3S
The Bach 1¼C has a wider cup diameter, the Bach 1¼C features a deeper cup.
Mouthpiece A
Bach 1¼C
• Trumpet
Cup diameter17.00 mm / 0.6693 in
Cup depthMedium
Rim width—
Throat diameter3.66 mm / 0.1441 in
Backbore—
Finish—
Material—
vs
Mouthpiece B
GR Technologies 3S
• Trumpet
Cup diameter16.76 mm / 0.6598 in
Cup depthShallow
Rim width—
Throat diameter—
Backbore—
Finish—
Material—
Cup Diameter
The Bach 1¼C has a cup diameter of 17.00 mm / 0.6693 in compared to 16.76 mm / 0.6598 in on the GR Technologies 3S — a difference of 0.24 mm / 0.0094 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Bach 1¼C has a medium cup while the GR Technologies 3S 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.