Bruno Tilz 211-TS 6 vs Yamaha HR-30D4
The Bruno Tilz 211-TS 6 has a wider cup diameter, the Yamaha HR-30D4 has a larger throat opening.
Cup Diameter
The Bruno Tilz 211-TS 6 has a cup diameter of 18.50 mm / 0.7283 in compared to 17.08 mm / 0.6724 in on the Yamaha HR-30D4 — a difference of 1.42 mm / 0.0559 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
Both mouthpieces share a deep cup depth, so the sound character from depth alone will be very similar.
Throat Diameter
The Yamaha HR-30D4 has a wider throat (4.50 mm / 0.1772 in vs 4.30 mm / 0.1693 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.