Which has a bigger cup — Bob Reeves 43/F or GR Technologies 66.5FL Almeida?

The Bob Reeves 43/F has a cup diameter of 17.07 mm / 0.6720 in compared to 16.89 mm / 0.6650 in on the GR Technologies 66.5FL Almeida — a difference of 0.18 mm / 0.0071 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bob Reeves 43/F and GR Technologies 66.5FL Almeida?

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

Bob Reeves 43/F vs GR Technologies 66.5FL Almeida

Name: GR Technologies 66.5FL Almeida
Brand: GR Technologies

The Bob Reeves 43/F 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

Bob Reeves 43/F

• Flugelhorn

Backbore—

Mouthpiece B

GR Technologies 66.5FL Almeida

• Flugelhorn

Backbore—

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.