Bach 17C vs Bruno Tilz 304- A 2
The Bach 17C has a wider cup diameter, the Bach 17C features a deeper cup, the Bach 17C has a larger throat opening.
Cup Diameter
The Bach 17C has a cup diameter of 24.20 mm / 0.9528 in compared to 23.00 mm / 0.9055 in on the Bruno Tilz 304- A 2 — a difference of 1.20 mm / 0.0472 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Bach 17C has a shallow cup while the Bruno Tilz 304- 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 17C 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.