Bob Reeves 40/M/X vs Denis Wick 4B
The Denis Wick 4B has a wider cup diameter.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bob Reeves 40/M/X
• Cornet
Cup diameter15.88 mm / 0.6252 in
vs
Mouthpiece B
Denis Wick 4B
• Cornet
Cup diameter16.50 mm / 0.6496 in
Best suited for
All-round versatile — balanced cup for general playing
High-volume projection — open throat for power
Cup Diameter
The Denis Wick 4B has a cup diameter of 16.50 mm / 0.6496 in compared to 15.88 mm / 0.6252 in on the Bob Reeves 40/M/X — a difference of 0.62 mm / 0.0244 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.