Which has a bigger cup — Bach 3E or Bach 7D?

The Bach 3E has a cup diameter of 16.30 mm / 0.6417 in compared to 16.20 mm / 0.6378 in on the Bach 7D — a difference of 0.10 mm / 0.0039 in. A wider cup generally produces a fuller, darker tone but requires more air support.

Bach 3E vs Bach 7D

Name: Bach 7D
Brand: Bach

The Bach 3E 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 3E

• Cornet

Cup depthShallow

Mouthpiece B

Bach 7D

• Cornet

Cup depthShallow

Best suited for

🎺Lead / commercial — shallow cup for brightness and range

Cup Depth

Both mouthpieces share a shallow 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.