Bach 10 vs Bruno Tilz 211-A4
The Bruno Tilz 211-A4 has a wider cup diameter, the Bach 10 features a deeper cup, the Bach 10 has a larger throat opening.
Cup Diameter
The Bruno Tilz 211-A4 has a cup diameter of 17.50 mm / 0.6890 in compared to 16.80 mm / 0.6614 in on the Bach 10 — a difference of 0.70 mm / 0.0276 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Bach 10 has a very deep cup while the Bruno Tilz 211-A4 has a very shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
The Bach 10 has a wider throat (4.50 mm / 0.1772 in vs 4.00 mm / 0.1575 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.