Marcinkiewicz E14B. Shew #1 vs Yamaha TR-14B4-GP
The Yamaha TR-14B4-GP has a wider cup diameter, the Marcinkiewicz E14B. Shew #1 features a deeper cup, the Yamaha TR-14B4-GP has a larger throat opening.
Cup Diameter
The Yamaha TR-14B4-GP has a cup diameter of 16.85 mm / 0.6634 in compared to 16.81 mm / 0.6618 in on the Marcinkiewicz E14B. Shew #1 — a difference of 0.04 mm / 0.0016 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Marcinkiewicz E14B. Shew #1 has a deep cup while the Yamaha TR-14B4-GP has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
The Yamaha TR-14B4-GP has a wider throat (3.65 mm / 0.1437 in vs 3.56 mm / 0.1402 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.