Bach 5C vs Bob Reeves 40/SV/692
The Bach 5C has a wider cup diameter, the Bach 5C features a deeper cup.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 5C
• Trumpet
Cup diameter16.25 mm / 0.6398 in
Best suited for
All-round versatile — balanced cup for general playing
vs
Mouthpiece B
Bob Reeves 40/SV/692
• Trumpet
Cup diameter15.88 mm / 0.6252 in
Best suited for
Lead / commercial — shallow cup for brightness and range
Cup Diameter
The Bach 5C has a cup diameter of 16.25 mm / 0.6398 in compared to 15.88 mm / 0.6252 in on the Bob Reeves 40/SV/692 — a difference of 0.37 mm / 0.0146 in. A wider cup generally produces a fuller, darker tone but requires more air support.
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.