Curry 128G vs Marcinkiewicz CH 18
The Marcinkiewicz CH 18 has a wider cup diameter, the Marcinkiewicz CH 18 has a larger throat opening.
Cup Diameter
The Marcinkiewicz CH 18 has a cup diameter of 32.77 mm / 1.2902 in compared to 32.51 mm / 1.2800 in on the Curry 128G — a difference of 0.26 mm / 0.0102 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
Both mouthpieces share a deep cup depth, so the sound character from depth alone will be very similar.
Throat Diameter
The Marcinkiewicz CH 18 has a wider throat (8.20 mm / 0.3228 in vs 8.18 mm / 0.3220 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.