Bruno Tilz 214-D 5 vs Bruno Tilz 306-3 A
The Bruno Tilz 306-3 A has a wider cup diameter, the Bruno Tilz 306-3 A features a deeper cup, the Bruno Tilz 306-3 A has a larger throat opening.
The narrowest point at the bottom of the cup. Affects resistance, volume, and tone color.
Mouthpiece A
Bruno Tilz 214-D 5
• Trombone
CatalogThroat diameter6.30 mm / 0.2480 in
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Bruno Tilz 306-3 A
• Trombone
CatalogThroat diameter7.20 mm / 0.2835 in
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
Throat Diameter
The Bruno Tilz 306-3 A has a wider throat (7.20 mm / 0.2835 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?
Both mouthpieces are categorized as "Catalog" — the physical dimensions above will determine which suits your embouchure and playing style better.