Marcinkiewicz ET7D. Steinmeyer vs Yamaha SL-48L
The Yamaha SL-48L has a wider cup diameter, the Marcinkiewicz ET7D. Steinmeyer features a deeper cup, the Yamaha SL-48L has a larger throat opening.
Cup Diameter
The Yamaha SL-48L has a cup diameter of 25.25 mm / 0.9941 in compared to 24.92 mm / 0.9811 in on the Marcinkiewicz ET7D. Steinmeyer — a difference of 0.33 mm / 0.0130 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Marcinkiewicz ET7D. Steinmeyer has a very deep cup while the Yamaha SL-48L has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
The Yamaha SL-48L has a wider throat (6.62 mm / 0.2606 in vs 5.79 mm / 0.2280 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.