Bach 12E vs Bruno Tilz 304- A 2
The Bach 12E has a wider cup diameter, the Bach 12E features a deeper cup, the Bach 12E has a larger throat opening.
Cup Diameter
The Bach 12E has a cup diameter of 24.50 mm compared to 23.00 mm on the Bruno Tilz 304- A 2 — a difference of +1.50 mm. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Bach 12E 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 12E has a wider throat (5.85 mm vs 4.60 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.