Bach 12C vs Bruno Tilz 215-9 G
The Bruno Tilz 215-9 G has a wider cup diameter, the Bruno Tilz 215-9 G features a deeper cup, the Bruno Tilz 215-9 G has a larger throat opening.
Cup Diameter
The Bruno Tilz 215-9 G has a cup diameter of 29.00 mm / 1.1417 in compared to 24.50 mm / 0.9646 in on the Bach 12C — a difference of 4.50 mm / 0.1772 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Bruno Tilz 215-9 G has a deep cup while the Bach 12C has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
The Bruno Tilz 215-9 G has a wider throat (7.20 mm / 0.2835 in vs 5.85 mm / 0.2303 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.