Bob Reeves 11C vs Bob Reeves Clarke 6.5AL-L
The Bob Reeves Clarke 6.5AL-L has a wider cup diameter, the Bob Reeves Clarke 6.5AL-L features a deeper cup.
Mouthpiece A
Bob Reeves 11C
• Trombone
Cup diameter24.80 mm / 0.9764 in
Cup depthShallow
Rim width—
Throat diameter—
Backbore—
Finish—
Material—
vs
Mouthpiece B
Bob Reeves Clarke 6.5AL-L
• Trombone
Cup diameter25.35 mm / 0.9980 in
Cup depthMedium
Rim width—
Throat diameter—
Backbore—
Finish—
Material—
Cup Diameter
The Bob Reeves Clarke 6.5AL-L has a cup diameter of 25.35 mm / 0.9980 in compared to 24.80 mm / 0.9764 in on the Bob Reeves 11C — a difference of 0.55 mm / 0.0217 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Bob Reeves Clarke 6.5AL-L has a medium cup while the Bob Reeves 11C has a shallow 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.