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.

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

How deep the cup is, from shallow (brighter, easier high register) to deep (darker, fuller sound).

Mouthpiece A

Bach 5A

• Cornet

Cup depthVery deep

Mouthpiece B

Bach 7A

• Cornet

Cup depthVery deep

Cup Depth

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

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.