Schilke 44E4 vs Yamaha SL-45C2S-GP
The Schilke 44E4 has a wider cup diameter, the Schilke 44E4 features a deeper cup, the Schilke 44E4 has a larger throat opening.
Cup Diameter
The Schilke 44E4 has a cup diameter of 24.28 mm / 0.9559 in compared to 24.26 mm / 0.9551 in on the Yamaha SL-45C2S-GP — a difference of 0.02 mm / 0.0008 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Schilke 44E4 has a very deep cup while the Yamaha SL-45C2S-GP has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
The Schilke 44E4 has a wider throat (5.95 mm / 0.2343 in vs 5.85 mm / 0.2303 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.