Marcinkiewicz 6 / 10.5C vs Yamaha TR-14B4
The Yamaha TR-14B4 has a wider cup diameter, the Marcinkiewicz 6 / 10.5C features a deeper cup, the Marcinkiewicz 6 / 10.5C has a larger throat opening.
Cup Diameter
The Yamaha TR-14B4 has a cup diameter of 16.85 mm / 0.6634 in compared to 16.84 mm / 0.6630 in on the Marcinkiewicz 6 / 10.5C — a difference of 0.01 mm / 0.0004 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Marcinkiewicz 6 / 10.5C 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
The Marcinkiewicz 6 / 10.5C 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.