Bruno Tilz 305-D 5 vs Giardinelli 4D
The Bruno Tilz 305-D 5 has a wider cup diameter, the Giardinelli 4D features a deeper cup, the Giardinelli 4D has a larger throat opening.
Cup Diameter
The Bruno Tilz 305-D 5 has a cup diameter of 26.00 mm / 1.0236 in compared to 25.40 mm / 1.0000 in on the Giardinelli 4D — a difference of 0.60 mm / 0.0236 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Giardinelli 4D has a deep cup while the Bruno Tilz 305-D 5 has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
The Giardinelli 4D has a wider throat (6.40 mm / 0.2520 in vs 6.30 mm / 0.2480 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.