Bach 7BW vs Bach 8½A
The Bach 7BW has a wider cup diameter, the Bach 8½A features a deeper cup.
The narrowest point at the bottom of the cup. Affects resistance, volume, and tone color.
Mouthpiece A
Bach 7BW
• Cornet
Throat diameter3.66 mm / 0.1441 in
vs
Mouthpiece B
Bach 8½A
• Cornet
Throat diameter3.66 mm / 0.1441 in
Throat Diameter
Throat diameters are essentially identical at 3.66 mm / 0.1441 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.