Bach 4C vs Bruno Tilz 213- S 1
The Bach 4C has a wider cup diameter, the Bruno Tilz 213- S 1 features a deeper cup, the Bach 4C has a larger throat opening.
Cup Diameter
The Bach 4C has a cup diameter of 25.75 mm compared to 22.00 mm on the Bruno Tilz 213- S 1 — a difference of +3.75 mm. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Bruno Tilz 213- S 1 has a medium cup while the Bach 4C has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
The Bach 4C has a wider throat (5.85 mm vs 4.40 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.