Bruno Tilz 310-M 27 vs Marcinkiewicz CH 18
The Bruno Tilz 310-M 27 has a wider cup diameter.
Mouthpiece A
Bruno Tilz 310-M 27
• Tuba
CatalogCup diameter33.00 mm / 1.2992 in
Cup depthDeep
Rim width—
Throat diameter8.20 mm / 0.3228 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
Marcinkiewicz CH 18
• Tuba
Cup diameter32.77 mm / 1.2902 in
Cup depthDeep
Rim width—
Throat diameter8.20 mm / 0.3228 in
Backbore—
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 310-M 27 has a cup diameter of 33.00 mm / 1.2992 in compared to 32.77 mm / 1.2902 in on the Marcinkiewicz CH 18 — a difference of 0.23 mm / 0.0091 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
Both mouthpieces share a deep cup depth, so the sound character from depth alone will be very similar.
Throat Diameter
Throat diameters are essentially identical at 8.20 mm / 0.3228 in, so resistance feel will be comparable.
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.