Bruno Tilz 215-10 GT vs Yamaha SL-YEO-S
The Bruno Tilz 215-10 GT has a wider cup diameter, the Yamaha SL-YEO-S has a larger throat opening.
Mouthpiece A
Bruno Tilz 215-10 GT
• Trombone
CatalogCup diameter29.50 mm / 1.1614 in
Cup depth
Rim width—
Throat diameter7.80 mm / 0.3071 in
Backbore—
Finish—
Material—
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Yamaha SL-YEO-S
• Trombone
Cup diameter28.72 mm / 1.1307 in
Cup depthDeep
Rim width—
Throat diameter8.00 mm / 0.3150 in
BackboreSemi-wide
Finish—
Material—
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
Cup Diameter
The Bruno Tilz 215-10 GT has a cup diameter of 29.50 mm / 1.1614 in compared to 28.72 mm / 1.1307 in on the Yamaha SL-YEO-S — a difference of 0.78 mm / 0.0307 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Throat Diameter
The Yamaha SL-YEO-S has a wider throat (8.00 mm / 0.3150 in vs 7.80 mm / 0.3071 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.