Which has a bigger cup — Bach 8 or Bach 8¾?

The Bach 8 has a cup diameter of 16.20 mm / 0.6378 in compared to 16.10 mm / 0.6339 in on the Bach 8¾ — a difference of 0.10 mm / 0.0039 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 8 and Bach 8¾?

Both mouthpieces share a very deep cup depth, so the sound character from depth alone will be very similar.

Bach 8 vs Bach 8¾

Name: Bach 8¾
Brand: Bach

The Bach 8 has a wider cup diameter.

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

The taper behind the throat leading to the shank. Affects projection and tone character.

Mouthpiece A

Bach 8

• Cornet

Backbore—

Mouthpiece B

Bach 8¾

• Cornet

Backbore—

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.