Denis Wick 3BFL vs Denis Wick 4F
The Denis Wick 3BFL has a wider cup diameter, the Denis Wick 4F features a deeper cup.
Cup Diameter
The Denis Wick 3BFL has a cup diameter of 16.75 mm / 0.6594 in compared to 16.50 mm / 0.6496 in on the Denis Wick 4F — 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 4F has a very deep cup while the Denis Wick 3BFL has a deep cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
Throat diameters are essentially identical at 4.58 mm / 0.1803 in, so resistance feel will be comparable.
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.