Bach 11 vs Bruno Tilz 304- B 1
The Bach 11 has a wider cup diameter, the Bach 11 features a deeper cup, the Bach 11 has a larger throat opening.
Cup Diameter
The Bach 11 has a cup diameter of 24.70 mm compared to 22.00 mm on the Bruno Tilz 304- B 1 — a difference of +2.70 mm. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Bach 11 has a deep cup while the Bruno Tilz 304- B 1 has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
The Bach 11 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.