Which has a bigger cup — Bach 7A or Bach 8¾?

The Bach 7A 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 7A and Bach 8¾?

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

Bach 7A vs Bach 8¾

Name: Bach 8¾
Brand: Bach

The Bach 7A has a wider cup diameter.

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

The narrowest point at the bottom of the cup. Affects resistance, volume, and tone color.

Mouthpiece A

Bach 7A

• Cornet

Throat diameter3.66 mm / 0.1441 in

Mouthpiece B

Bach 8¾

• 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.