Bruno Tilz 306-8 GS vs Yamaha SL-48L
The Bruno Tilz 306-8 GS has a wider cup diameter, the Yamaha SL-48L features a deeper cup, the Bruno Tilz 306-8 GS has a larger throat opening.
Cup Diameter
The Bruno Tilz 306-8 GS has a cup diameter of 28.00 mm / 1.1024 in compared to 25.25 mm / 0.9941 in on the Yamaha SL-48L — a difference of 2.75 mm / 0.1083 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Yamaha SL-48L has a medium cup while the Bruno Tilz 306-8 GS has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
The Bruno Tilz 306-8 GS has a wider throat (7.00 mm / 0.2756 in vs 6.62 mm / 0.2606 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.