Denis Wick 4BS vs Yamaha SL-52S
The Denis Wick 4BS has a wider cup diameter, the Denis Wick 4BS has a larger throat opening.
Cup Diameter
The Denis Wick 4BS has a cup diameter of 25.90 mm / 1.0197 in compared to 25.65 mm / 1.0098 in on the Yamaha SL-52S — 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
Both mouthpieces share a medium cup depth, so the sound character from depth alone will be very similar.
Throat Diameter
The Denis Wick 4BS has a wider throat (7.13 mm / 0.2807 in vs 7.11 mm / 0.2799 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.