Bach 12 vs Bruno Tilz 310-M 4
The Bach 12 has a wider cup diameter, the Bruno Tilz 310-M 4 features a deeper cup, the Bach 12 has a larger throat opening.
Cup Diameter
The Bach 12 has a cup diameter of 32.75 mm compared to 31.00 mm on the Bruno Tilz 310-M 4 — a difference of +1.75 mm. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Bruno Tilz 310-M 4 has a deep cup while the Bach 12 has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
The Bach 12 has a wider throat (8.33 mm vs 8.30 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.