Bruno Tilz 300-20 1/2 C vs Schilke 13A4a
The Bruno Tilz 300-20 1/2 C has a wider cup diameter, the Bruno Tilz 300-20 1/2 C features a deeper cup, the Bruno Tilz 300-20 1/2 C has a larger throat opening.
Cup Diameter
The Bruno Tilz 300-20 1/2 C has a cup diameter of 18.00 mm / 0.7087 in compared to 16.76 mm / 0.6598 in on the Schilke 13A4a — a difference of 1.24 mm / 0.0488 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Bruno Tilz 300-20 1/2 C has a medium cup while the Schilke 13A4a 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 300-20 1/2 C has a wider throat (3.70 mm / 0.1457 in vs 3.66 mm / 0.1441 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.