Which has a bigger cup — Bach 5MV or Bach 6BM?

The Bach 5MV has a cup diameter of 16.25 mm / 0.6398 in compared to 16.20 mm / 0.6378 in on the Bach 6BM — 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 5MV and Bach 6BM?

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

Bach 5MV vs Bach 6BM

Name: Bach 6BM
Brand: Bach

The Bach 5MV has a wider cup diameter, the Bach 5MV has a larger throat opening.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material

The taper behind the throat leading to the shank. Affects projection and tone character.

Mouthpiece A

Bach 5MV

• Cornet

Backbore—

Best suited for

📣High-volume projection — open throat for power

Mouthpiece B

Bach 6BM

• Cornet

Backbore—

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.