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

The Bach 5A 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 5A and Bach 8½A?

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

Bach 5A vs Bach 8½A

Name: Bach 8½A
Brand: Bach

The Bach 5A has a wider cup diameter.

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

Base metal or construction (e.g. brass, stainless steel, plastic). Influences weight, response, and tone color.

Mouthpiece A

Bach 5A

• Cornet

Material—

Mouthpiece B

Bach 8½A

• Cornet

Material—

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.