Which has a bigger cup — Bach 8½A or Bob Reeves 40/B/s?

The Bach 8½A has a cup diameter of 16.10 mm / 0.6339 in compared to 15.88 mm / 0.6252 in on the Bob Reeves 40/B/s — a difference of 0.22 mm / 0.0087 in. A wider cup generally produces a fuller, darker tone but requires more air support.

Bach 8½A vs Bob Reeves 40/B/s

Name: Bob Reeves 40/B/s
Brand: Bob Reeves

The Bach 8½A 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 8½A

• Cornet

Cup depthVery deep

Mouthpiece B

Bob Reeves 40/B/s

• 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.