Bach 12C vs Bruno Tilz 305-A 2
The Bruno Tilz 305-A 2 has a wider cup diameter, the Bach 12C features a deeper cup, the Bach 12C has a larger throat opening.
Cup Diameter
The Bruno Tilz 305-A 2 has a cup diameter of 25.00 mm / 0.9843 in compared to 24.50 mm / 0.9646 in on the Bach 12C — a difference of 0.50 mm / 0.0197 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Bach 12C has a shallow cup while the Bruno Tilz 305-A 2 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 12C has a wider throat (5.85 mm / 0.2303 in vs 5.40 mm / 0.2126 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.
Compare Bach 12C with others
Compare Bruno Tilz 305-A 2 with others
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