Which has a bigger cup — Bach 8½A or Bob Reeves 41/B/X?

The Bob Reeves 41/B/X has a cup diameter of 16.27 mm / 0.6406 in compared to 16.10 mm / 0.6339 in on the Bach 8½A — a difference of 0.17 mm / 0.0067 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 8½A and Bob Reeves 41/B/X?

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

Bach 8½A vs Bob Reeves 41/B/X

Name: Bob Reeves 41/B/X
Brand: Bob Reeves

The Bob Reeves 41/B/X has a wider cup diameter.

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

The width of the rim surface that contacts the lips. Wider rims improve endurance; narrower rims improve flexibility.

Mouthpiece A

Bach 8½A

• Cornet

Rim width—

Mouthpiece B

Bob Reeves 41/B/X

• Cornet

Rim width—

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.