Bach 3C vs Bob Reeves 40/S/692s
The Bach 3C has a wider cup diameter, the Bach 3C features a deeper cup.
Mouthpiece A
Bach 3C
• Trumpet
Cup diameter16.30 mm / 0.6417 in
Cup depthMedium
Rim width—
Throat diameter3.66 mm / 0.1441 in
Backbore—
Finish—
Material—
Best suited for
All-round versatile — balanced cup for general playing
vs
Mouthpiece B
Bob Reeves 40/S/692s
• Trumpet
Cup diameter15.88 mm / 0.6252 in
Cup depthShallow
Rim width—
Throat diameter—
Backbore692s
Finish—
Material—
Best suited for
Lead / commercial — shallow cup for brightness and range
Cup Diameter
The Bach 3C has a cup diameter of 16.30 mm / 0.6417 in compared to 15.88 mm / 0.6252 in on the Bob Reeves 40/S/692s — a difference of 0.42 mm / 0.0165 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Bach 3C has a medium cup while the Bob Reeves 40/S/692s 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.