Bach 18 vs Bruno Tilz 211-TS 6
The Bruno Tilz 211-TS 6 has a wider cup diameter, the Bruno Tilz 211-TS 6 features a deeper cup, the Bach 18 has a larger throat opening.
Cup Diameter
The Bruno Tilz 211-TS 6 has a cup diameter of 18.50 mm / 0.7283 in compared to 16.15 mm / 0.6358 in on the Bach 18 — a difference of 2.35 mm / 0.0925 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Bruno Tilz 211-TS 6 has a deep cup while the Bach 18 has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
The Bach 18 has a wider throat (4.50 mm / 0.1772 in vs 4.30 mm / 0.1693 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.