Which has a bigger cup — Bach 10 or Bach 8¾?

The Bach 8¾ has a cup diameter of 16.10 mm / 0.6339 in compared to 16.00 mm / 0.6299 in on the Bach 10 — 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 10 and Bach 8¾?

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

Bach 10 vs Bach 8¾

Name: Bach 8¾
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 10

• Cornet

Finish—

Mouthpiece B

Bach 8¾

• 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.