Schilke 14 vs Yamaha TR-14B4
The Schilke 14 has a wider cup diameter, the Schilke 14 features a deeper cup.
Cup Diameter
The Schilke 14 has a cup diameter of 17.02 mm / 0.6701 in compared to 16.85 mm / 0.6634 in on the Yamaha TR-14B4 — a difference of 0.17 mm / 0.0067 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Schilke 14 has a medium cup while the Yamaha TR-14B4 has a shallow 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 3.65 mm / 0.1437 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.