Denis Wick 5BS vs Yamaha SL-48S-GP
The Denis Wick 5BS has a wider cup diameter, the Denis Wick 5BS has a larger throat opening.
Cup Diameter
The Denis Wick 5BS has a cup diameter of 25.73 mm / 1.0130 in compared to 25.25 mm / 0.9941 in on the Yamaha SL-48S-GP — a difference of 0.48 mm / 0.0189 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 5BS has a wider throat (6.87 mm / 0.2705 in vs 6.62 mm / 0.2606 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.