Bruno Tilz 305-D 4 vs Giardinelli Sym. T
the Giardinelli Sym. T has a larger throat opening.
Mouthpiece A
Bruno Tilz 305-D 4
• Trombone
CatalogCup diameter25.80 mm / 1.0157 in
Cup depthDeep
Rim width—
Throat diameter6.20 mm / 0.2441 in
Backbore—
Finish—
Material—
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
vs
Mouthpiece B
Giardinelli Sym. T
• Trombone
Cup diameter25.80 mm / 1.0157 in
Cup depthDeep
Rim width—
Throat diameter6.40 mm / 0.2520 in
Backbore1/4 (.250)"
Finish—
Material—
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
Cup Diameter
Both mouthpieces have virtually identical cup diameters at 25.80 mm / 1.0157 in.
Cup Depth
Both mouthpieces share a deep cup depth, so the sound character from depth alone will be very similar.
Throat Diameter
The Giardinelli Sym. T has a wider throat (6.40 mm / 0.2520 in vs 6.20 mm / 0.2441 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.