Bach 5C vs GR Technologies 63S
The Bach 5C has a wider cup diameter, the Bach 5C features a deeper cup.
The narrowest point at the bottom of the cup. Affects resistance, volume, and tone color.
Mouthpiece A
Bach 5C
• Trumpet
Throat diameter3.66 mm / 0.1441 in
Best suited for
All-round versatile — balanced cup for general playing
vs
Mouthpiece B
GR Technologies 63S
• Trumpet
Throat diameter—
Best suited for
Lead / commercial — shallow cup for brightness and range
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.