Bach 1¼G vs Bruno Tilz 306-3 A
the Bach 1¼G features a deeper cup, the Bruno Tilz 306-3 A has a larger throat opening.
Mouthpiece A
Bach 1¼G
• Trombone
Cup diameter27.50 mm / 1.0827 in
Cup depthVery deep
Rim width—
Throat diameter7.01 mm / 0.2760 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
Bruno Tilz 306-3 A
• Trombone
CatalogCup diameter27.50 mm / 1.0827 in
Cup depthDeep
Rim width—
Throat diameter7.20 mm / 0.2835 in
Backbore—
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 27.50 mm / 1.0827 in.
Cup Depth
The Bach 1¼G has a very deep cup while the Bruno Tilz 306-3 A has a deep cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
The Bruno Tilz 306-3 A has a wider throat (7.20 mm / 0.2835 in vs 7.01 mm / 0.2760 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.