Bruno Tilz 231-C 4 vs Yamaha BB-67C4
The Bruno Tilz 231-C 4 has a wider cup diameter, the Bruno Tilz 231-C 4 features a deeper cup, the Bruno Tilz 231-C 4 has a larger throat opening.
Cup Diameter
The Bruno Tilz 231-C 4 has a cup diameter of 33.00 mm / 1.2992 in compared to 32.06 mm / 1.2622 in on the Yamaha BB-67C4 — a difference of 0.94 mm / 0.0370 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Bruno Tilz 231-C 4 has a deep cup while the Yamaha BB-67C4 has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
The Bruno Tilz 231-C 4 has a wider throat (8.20 mm / 0.3228 in vs 8.10 mm / 0.3189 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.