Which has a bigger cup — Bob Reeves 4G or Bob Reeves CV?

The Bob Reeves CV has a cup diameter of 29.50 mm / 1.1614 in compared to 26.00 mm / 1.0236 in on the Bob Reeves 4G — a difference of 3.50 mm / 0.1378 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bob Reeves 4G and Bob Reeves CV?

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

Bob Reeves 4G vs Bob Reeves CV

Name: Bob Reeves CV
Brand: Bob Reeves

The Bob Reeves CV 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

Bob Reeves 4G

• Trombone

Material—

Best suited for

🎻Orchestral playing — large cup for full, dark tone

Mouthpiece B

Bob Reeves CV

• Trombone

Material—

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.