Bach 5B Flugel vs Denis Wick 4FL
The Denis Wick 4FL has a wider cup diameter, the Denis Wick 4FL features a deeper cup, the Denis Wick 4FL has a larger throat opening.
Cup Diameter
The Denis Wick 4FL has a cup diameter of 16.50 mm / 0.6496 in compared to 16.25 mm / 0.6398 in on the Bach 5B Flugel — a difference of 0.25 mm / 0.0098 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Denis Wick 4FL has a very deep cup while the Bach 5B Flugel has a deep cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
The Denis Wick 4FL has a wider throat (4.58 mm / 0.1803 in vs 3.99 mm / 0.1571 in). A wider throat allows more air through, increasing volume and projection but reducing resistance.
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.