Bach 8½A vs Bob Reeves 43N/B/X
The Bob Reeves 43N/B/X has a wider cup diameter.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 8½A
• Cornet
Cup diameter16.10 mm / 0.6339 in
vs
Mouthpiece B
Bob Reeves 43N/B/X
• Cornet
Cup diameter17.07 mm / 0.6720 in
Best suited for
Orchestral playing — large cup for full, dark tone
Cup Diameter
The Bob Reeves 43N/B/X has a cup diameter of 17.07 mm / 0.6720 in compared to 16.10 mm / 0.6339 in on the Bach 8½A — a difference of 0.97 mm / 0.0382 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.