Bach 10 vs Bob Reeves 43/S/s
The Bob Reeves 43/S/s has a wider cup diameter, the Bach 10 features a deeper cup.
Mouthpiece A
Bach 10
• Cornet
Cup diameter16.00 mm
Cup depthVery deep
Rim width—
Throat diameter3.66 mm
Backbore—
Finish—
Material—
vs
Mouthpiece B
Bob Reeves 43/S/s
• Cornet
Cup diameter17.07 mm
Cup depthShallow
Rim width—
Throat diameter—
Backbores
Finish—
Material—
Cup Diameter
The Bob Reeves 43/S/s has a cup diameter of 17.07 mm compared to 16.00 mm on the Bach 10 — a difference of +1.07 mm. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Bach 10 has a very deep cup while the Bob Reeves 43/S/s 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.