Bach 1B vs Bob Reeves 43.5/D/2
The Bob Reeves 43.5/D/2 has a wider cup diameter.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 1B
• Cornet
Cup diameter17.00 mm / 0.6693 in
Best suited for
Orchestral playing — large cup for full, dark tone
vs
Mouthpiece B
Bob Reeves 43.5/D/2
• Cornet
Cup diameter17.26 mm / 0.6795 in
Best suited for
Orchestral playing — large cup for full, dark tone
Cup Diameter
The Bob Reeves 43.5/D/2 has a cup diameter of 17.26 mm / 0.6795 in compared to 17.00 mm / 0.6693 in on the Bach 1B — a difference of 0.26 mm / 0.0102 in. A wider cup generally produces a fuller, darker tone but requires more air support.
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.