Bach 4C vs Bruno Tilz 213- S 2
The Bach 4C has a wider cup diameter, the Bruno Tilz 213- S 2 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 / 1.0138 in compared to 23.00 mm / 0.9055 in on the Bruno Tilz 213- S 2 — 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 Bruno Tilz 213- S 2 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 / 0.2303 in vs 4.60 mm / 0.1811 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.