Bach 12E vs Bruno Tilz 215-10 GT
The Bruno Tilz 215-10 GT has a wider cup diameter, the Bruno Tilz 215-10 GT has a larger throat opening.
Mouthpiece A
Bach 12E
• Trombone
Cup diameter24.50 mm / 0.9646 in
Cup depthShallow
Rim width—
Throat diameter5.85 mm / 0.2303 in
Backbore—
Finish—
Material—
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
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
Cup Diameter
The Bruno Tilz 215-10 GT has a cup diameter of 29.50 mm / 1.1614 in compared to 24.50 mm / 0.9646 in on the Bach 12E — a difference of 5.00 mm / 0.1969 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Throat Diameter
The Bruno Tilz 215-10 GT has a wider throat (7.80 mm / 0.3071 in vs 5.85 mm / 0.2303 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.