Bach 8½A vs Denis Wick RW4
The Denis Wick RW4 has a wider cup diameter, the Denis Wick RW4 has a larger throat opening.
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
Denis Wick RW4
• Cornet
Cup diameter16.50 mm / 0.6496 in
Best suited for
High-volume projection — open throat for power
Cup Diameter
The Denis Wick RW4 has a cup diameter of 16.50 mm / 0.6496 in compared to 16.10 mm / 0.6339 in on the Bach 8½A — a difference of 0.40 mm / 0.0157 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.