Schilke 13A4a vs Yamaha TR-14C4
The Yamaha TR-14C4 has a wider cup diameter, the Yamaha TR-14C4 features a deeper cup, the Schilke 13A4a has a larger throat opening.
Cup Diameter
The Yamaha TR-14C4 has a cup diameter of 16.88 mm / 0.6646 in compared to 16.76 mm / 0.6598 in on the Schilke 13A4a — a difference of 0.12 mm / 0.0047 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Yamaha TR-14C4 has a medium cup while the Schilke 13A4a has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
The Schilke 13A4a has a wider throat (3.66 mm / 0.1441 in vs 3.65 mm / 0.1437 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.