Bach 4G vs Yamaha SL-YEO-S
The Yamaha SL-YEO-S has a wider cup diameter, the Bach 4G features a deeper cup, the Yamaha SL-YEO-S has a larger throat opening.
Cup Diameter
The Yamaha SL-YEO-S has a cup diameter of 28.72 mm / 1.1307 in compared to 26.00 mm / 1.0236 in on the Bach 4G — a difference of 2.72 mm / 0.1071 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Bach 4G has a very deep cup while the Yamaha SL-YEO-S has a deep cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
The Yamaha SL-YEO-S has a wider throat (8.00 mm / 0.3150 in vs 7.01 mm / 0.2760 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.
Compare Bach 4G with others
Compare Yamaha SL-YEO-S with others
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