Bach 22 vs Bach 25
The Bach 22 has a wider cup diameter.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 22
• Tuba
Cup diameter31.60 mm / 1.2441 in
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Bach 25
• Tuba
Cup diameter30.60 mm / 1.2047 in
Best suited for
High-volume projection — open throat for power
Cup Diameter
The Bach 22 has a cup diameter of 31.60 mm / 1.2441 in compared to 30.60 mm / 1.2047 in on the Bach 25 — a difference of 1.00 mm / 0.0394 in. A wider cup generally produces a fuller, darker tone but requires more air support.
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.