Bach 1G vs Yamaha BL-60L
The Yamaha BL-60L has a wider cup diameter, the Bach 1G features a deeper cup.
Cup Diameter
The Yamaha BL-60L has a cup diameter of 28.25 mm / 1.1122 in compared to 28.00 mm / 1.1024 in on the Bach 1G — a difference of 0.25 mm / 0.0098 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Bach 1G has a very deep cup while the Yamaha BL-60L has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
Throat diameters are essentially identical at 8.10 mm / 0.3189 in, so resistance feel will be comparable.
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.