Which has a bigger cup — Bach 8½A or Bob Reeves 42/B/692sL?

The Bob Reeves 42/B/692sL has a cup diameter of 16.67 mm / 0.6563 in compared to 16.10 mm / 0.6339 in on the Bach 8½A — a difference of 0.57 mm / 0.0224 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 42/B/692sL?

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

Bach 8½A vs Bob Reeves 42/B/692sL

Name: Bob Reeves 42/B/692sL
Brand: Bob Reeves

The Bob Reeves 42/B/692sL has a wider cup diameter.

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 8½A

• Cornet

Backbore—

Mouthpiece B

Bob Reeves 42/B/692sL

• Cornet

Backbore692sL

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.