Conn Precision 3 vs Yamaha CR-14ES
The Yamaha CR-14ES has a wider cup diameter, the Yamaha CR-14ES features a deeper cup.
Cup Diameter
The Yamaha CR-14ES has a cup diameter of 16.86 mm / 0.6638 in compared to 16.41 mm / 0.6461 in on the Conn Precision 3 — a difference of 0.45 mm / 0.0177 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Yamaha CR-14ES has a very deep cup while the Conn Precision 3 has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Material
The Conn Precision 3 is described as Silver-plated brass, and the Yamaha CR-14ES as unspecified. Material affects mass, warmth, and how quickly the piece responds.
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.