Which has a bigger cup — Bach 7B or Bach 9B?

The Bach 7B has a cup diameter of 16.20 mm / 0.6378 in compared to 16.05 mm / 0.6319 in on the Bach 9B — a difference of 0.15 mm / 0.0059 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 7B and Bach 9B?

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

Bach 7B vs Bach 9B

Name: Bach 9B
Brand: Bach

The Bach 7B 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 7B

• Cornet

Finish—

Mouthpiece B

Bach 9B

• 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.