Bruno Tilz 214-4 S vs Bruno Tilz 214-D 5
The Bruno Tilz 214-D 5 has a wider cup diameter, the Bruno Tilz 214-D 5 features a deeper cup, the Bruno Tilz 214-D 5 has a larger throat opening.
Cup Diameter
The Bruno Tilz 214-D 5 has a cup diameter of 26.00 mm / 1.0236 in compared to 25.50 mm / 1.0039 in on the Bruno Tilz 214-4 S — a difference of 0.50 mm / 0.0197 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Bruno Tilz 214-D 5 has a medium cup while the Bruno Tilz 214-4 S has a very shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
The Bruno Tilz 214-D 5 has a wider throat (6.30 mm / 0.2480 in vs 5.80 mm / 0.2283 in). A wider throat allows more air through, increasing volume and projection but reducing resistance.
Which is better?
Both mouthpieces are categorized as "Catalog" — the physical dimensions above will determine which suits your embouchure and playing style better.