Bob Reeves 40/B/X vs Giardinelli 12C
The Bob Reeves 40/B/X has a wider cup diameter, the Bob Reeves 40/B/X features a deeper cup.
Mouthpiece A
Bob Reeves 40/B/X
• Cornet
Cup diameter15.88 mm / 0.6252 in
Cup depthVery deep
Rim width—
Throat diameter—
BackboreX
Finish—
Material—
vs
Mouthpiece B
Giardinelli 12C
• Cornet
Cup diameter15.50 mm / 0.6102 in
Cup depthDeep
Rim width—
Throat diameter—
Backbore—
Finish—
Material—
Cup Diameter
The Bob Reeves 40/B/X has a cup diameter of 15.88 mm / 0.6252 in compared to 15.50 mm / 0.6102 in on the Giardinelli 12C — a difference of 0.38 mm / 0.0150 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Bob Reeves 40/B/X has a very deep cup while the Giardinelli 12C has a deep cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
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.