Bruno Tilz 306-5 GS vs Giardinelli 3GM
the Giardinelli 3GM features a deeper cup, the Bruno Tilz 306-5 GS has a larger throat opening.
Mouthpiece A
Bruno Tilz 306-5 GS
• Trombone
CatalogCup diameter26.00 mm / 1.0236 in
Cup depthMedium
Rim width—
Throat diameter6.80 mm / 0.2677 in
Backbore—
Finish—
Material—
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Giardinelli 3GM
• Trombone
Cup diameter26.00 mm / 1.0236 in
Cup depthDeep
Rim width—
Throat diameter6.75 mm / 0.2657 in
Backbore17/64 (.265)"
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 26.00 mm / 1.0236 in.
Cup Depth
The Giardinelli 3GM has a deep cup while the Bruno Tilz 306-5 GS has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
The Bruno Tilz 306-5 GS has a wider throat (6.80 mm / 0.2677 in vs 6.75 mm / 0.2657 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.