Bach 12E vs Schilke 50C4
The Schilke 50C4 has a wider cup diameter, the Schilke 50C4 features a deeper cup, the Schilke 50C4 has a larger throat opening.
Cup Diameter
The Schilke 50C4 has a cup diameter of 25.40 mm / 1.0000 in compared to 24.50 mm / 0.9646 in on the Bach 12E — a difference of 0.90 mm / 0.0354 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Schilke 50C4 has a deep cup while the Bach 12E has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
The Schilke 50C4 has a wider throat (6.53 mm / 0.2571 in vs 5.85 mm / 0.2303 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.