Bach 6BM vs Bach 8B
the Bach 6BM has a larger throat opening.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bach 6BM
• Cornet
Cup diameter16.20 mm / 0.6378 in
vs
Mouthpiece B
Bach 8B
• Cornet
Cup diameter16.20 mm / 0.6378 in
Cup Diameter
Both mouthpieces have virtually identical cup diameters at 16.20 mm / 0.6378 in.
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.