Which has a bigger cup — Bach 5V or Bach 8½A?

The Bach 5V has a cup diameter of 16.25 mm / 0.6398 in compared to 16.10 mm / 0.6339 in on the Bach 8½A — 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 5V and Bach 8½A?

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

Bach 5V vs Bach 8½A

Name: Bach 8½A
Brand: Bach

The Bach 5V has a wider cup diameter, the Bach 5V 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 5V

• Cornet

Backbore—

Best suited for

📣High-volume projection — open throat for power

Mouthpiece B

Bach 8½A

• 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.