Marcinkiewicz ETU1J. Self vs Yamaha BB-BOBO-SOLO-GP
The Marcinkiewicz ETU1J. Self has a wider cup diameter, the Marcinkiewicz ETU1J. Self features a deeper cup, the Marcinkiewicz ETU1J. Self has a larger throat opening.
Cup Diameter
The Marcinkiewicz ETU1J. Self has a cup diameter of 33.15 mm / 1.3051 in compared to 32.20 mm / 1.2677 in on the Yamaha BB-BOBO-SOLO-GP — a difference of 0.95 mm / 0.0374 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Marcinkiewicz ETU1J. Self has a medium cup while the Yamaha BB-BOBO-SOLO-GP has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
The Marcinkiewicz ETU1J. Self has a wider throat (8.03 mm / 0.3161 in vs 7.50 mm / 0.2953 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.