Bach 2½C vs Bob Reeves 40/D/s
The Bach 2½C has a wider cup diameter, the Bob Reeves 40/D/s features a deeper cup.
Mouthpiece A
Bach 2½C
• Cornet
Cup diameter16.40 mm / 0.6457 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/D/s
• Cornet
Cup diameter15.88 mm / 0.6252 in
Cup depthDeep
Rim width—
Throat diameter—
Backbores
Finish—
Material—
Cup Diameter
The Bach 2½C has a cup diameter of 16.40 mm / 0.6457 in compared to 15.88 mm / 0.6252 in on the Bob Reeves 40/D/s — a difference of 0.52 mm / 0.0205 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Bob Reeves 40/D/s has a deep cup while the Bach 2½C has a medium 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.