Which has a bigger cup — Bach 8½A or Bob Reeves 43/B/2?

The Bob Reeves 43/B/2 has a cup diameter of 17.07 mm / 0.6720 in compared to 16.10 mm / 0.6339 in on the Bach 8½A — a difference of 0.97 mm / 0.0382 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 43/B/2?

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

Bach 8½A vs Bob Reeves 43/B/2

Name: Bob Reeves 43/B/2
Brand: Bob Reeves

The Bob Reeves 43/B/2 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 43/B/2

• Cornet

Backbore2

Best suited for

🎻Orchestral playing — large cup for full, dark tone

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.