Marcinkiewicz CH 18 vs Marcinkiewicz CH ETU1
The Marcinkiewicz CH ETU1 has a wider cup diameter, the Marcinkiewicz CH 18 features a deeper cup, the Marcinkiewicz CH 18 has a larger throat opening.
Cup Diameter
The Marcinkiewicz CH ETU1 has a cup diameter of 33.15 mm / 1.3051 in compared to 32.77 mm / 1.2902 in on the Marcinkiewicz CH 18 — a difference of 0.38 mm / 0.0150 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Marcinkiewicz CH 18 has a deep cup while the Marcinkiewicz CH ETU1 has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
The Marcinkiewicz CH 18 has a wider throat (8.20 mm / 0.3228 in vs 8.03 mm / 0.3161 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.