Bruno Tilz 306-5 GS vs Giardinelli Sym. B.
The Giardinelli Sym. B. has a wider cup diameter, the Giardinelli Sym. B. features a deeper cup, the Giardinelli Sym. B. has a larger throat opening.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bruno Tilz 306-5 GS
• Trombone
CatalogCup diameter26.00 mm / 1.0236 in
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Giardinelli Sym. B.
• Trombone
Cup diameter26.70 mm / 1.0512 in
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
Cup Diameter
The Giardinelli Sym. B. has a cup diameter of 26.70 mm / 1.0512 in compared to 26.00 mm / 1.0236 in on the Bruno Tilz 306-5 GS — a difference of 0.70 mm / 0.0276 in. A wider cup generally produces a fuller, darker tone but requires more air support.
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.