Which has a bigger cup — Bach 8¾ or Bach 9?

The Bach 8¾ has a cup diameter of 16.10 mm / 0.6339 in compared to 16.05 mm / 0.6319 in on the Bach 9 — a difference of 0.05 mm / 0.0020 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 8¾ and Bach 9?

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

Bach 8¾ vs Bach 9

Name: Bach 9
Brand: Bach

The Bach 8¾ has a wider cup diameter.

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

Surface plating or treatment (e.g. silver plate, gold trim). Affects feel, durability, and appearance.

Mouthpiece A

Bach 8¾

• Cornet

Finish—

Mouthpiece B

Bach 9

• Cornet

Finish—

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.