Which has a bigger cup — Bach 5A or Bach 7A?

The Bach 5A has a cup diameter of 16.25 mm / 0.6398 in compared to 16.20 mm / 0.6378 in on the Bach 7A — 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 5A and Bach 7A?

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

Bach 5A vs Bach 7A

Name: Bach 7A
Brand: Bach

The Bach 5A 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 5A

• Cornet

Finish—

Mouthpiece B

Bach 7A

• 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.