Bach 6¾C vs Bach 8½BW
The Bach 6¾C has a wider cup diameter.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 6¾C
• Baritone / Euphonium
Cup diameter25.00 mm / 0.9843 in
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Bach 8½BW
• Baritone / Euphonium
Cup diameter24.75 mm / 0.9744 in
Best suited for
High-volume projection — open throat for power
Cup Diameter
The Bach 6¾C has a cup diameter of 25.00 mm / 0.9843 in compared to 24.75 mm / 0.9744 in on the Bach 8½BW — a difference of 0.25 mm / 0.0098 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.