Marcinkiewicz 305FL vs Yamaha FH-13F4
The Marcinkiewicz 305FL has a wider cup diameter, the Marcinkiewicz 305FL has a larger throat opening.
Cup Diameter
The Marcinkiewicz 305FL has a cup diameter of 17.20 mm / 0.6772 in compared to 16.66 mm / 0.6559 in on the Yamaha FH-13F4 — a difference of 0.54 mm / 0.0213 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
Both mouthpieces share a medium cup depth, so the sound character from depth alone will be very similar.
Throat Diameter
The Marcinkiewicz 305FL has a wider throat (4.32 mm / 0.1701 in vs 4.30 mm / 0.1693 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.