Bach 10½D vs Bob Reeves 43/S/s
The Bob Reeves 43/S/s has a wider cup diameter.
Mouthpiece A
Bach 10½D
• Cornet
Cup diameter15.90 mm
Cup depthShallow
Rim width—
Throat diameter3.66 mm
Backbore—
Finish—
Material—
Best suited for
Lead / commercial — shallow cup for brightness and range
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 15.90 mm on the Bach 10½D — a difference of +1.17 mm. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
Both mouthpieces share a shallow 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.