Which has a bigger cup — Bach 8½A or Bach 8¾C?

Both mouthpieces have virtually identical cup diameters at 16.10 mm / 0.6339 in.

How does cup depth compare between Bach 8½A and Bach 8¾C?

The Bach 8½A has a very deep cup while the Bach 8¾C has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Bach 8½A vs Bach 8¾C

Name: Bach 8¾C
Brand: Bach

the Bach 8½A features a deeper cup.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material

The width of the rim surface that contacts the lips. Wider rims improve endurance; narrower rims improve flexibility.

Mouthpiece A

Bach 8½A

• Cornet

Rim width—

Mouthpiece B

Bach 8¾C

• Cornet

Rim width—

Best suited for

🎺Lead / commercial — shallow cup for brightness and range

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.