Yamaha BB-BOBO-SYM-S vs Yamaha BB-SELF
The Yamaha BB-BOBO-SYM-S has a wider cup diameter, the Yamaha BB-SELF features a deeper cup, the Yamaha BB-SELF has a larger throat opening.
Cup Diameter
The Yamaha BB-BOBO-SYM-S has a cup diameter of 32.90 mm compared to 32.86 mm on the Yamaha BB-SELF — a difference of +0.04 mm. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Yamaha BB-SELF has a medium cup while the Yamaha BB-BOBO-SYM-S has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
The Yamaha BB-SELF has a wider throat (8.00 mm vs 7.50 mm). 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.