Bach 5C vs Bob Reeves 40/M/692s
The Bach 5C has a wider cup diameter.
Mouthpiece A
Bach 5C
• Trumpet
Cup diameter16.25 mm / 0.6398 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/M/692s
• Trumpet
Cup diameter15.88 mm / 0.6252 in
Cup depthMedium
Rim width—
Throat diameter—
Backbore692s
Finish—
Material—
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/M/692s — a difference of 0.37 mm / 0.0146 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
Both mouthpieces share a medium cup depth, so the sound character from depth alone will be very similar.
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.