Bach 4GB vs Bruno Tilz 214-D 5
the Bach 4GB features a deeper cup, the Bach 4GB has a larger throat opening.
Mouthpiece A
Bach 4GB
• Trombone
Cup diameter26.00 mm / 1.0236 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 214-D 5
• Trombone
CatalogCup diameter26.00 mm / 1.0236 in
Cup depthMedium
Rim width—
Throat diameter6.30 mm / 0.2480 in
Backbore—
Finish—
Material—
Best suited for
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 Bach 4GB has a very deep cup while the Bruno Tilz 214-D 5 has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
The Bach 4GB has a wider throat (7.01 mm / 0.2760 in vs 6.30 mm / 0.2480 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.