GR Technologies G66FD Radtke vs GR Technologies G66FL Radtke
the GR Technologies G66FD Radtke features a deeper cup.
Mouthpiece A
GR Technologies G66FD Radtke
• Flugelhorn
Cup diameter16.76 mm / 0.6598 in
Cup depthDeep
Rim width—
Throat diameter—
Backbore—
Finish—
Material—
vs
Mouthpiece B
GR Technologies G66FL Radtke
• Flugelhorn
Cup diameter16.76 mm / 0.6598 in
Cup depthMedium
Rim width—
Throat diameter—
Backbore—
Finish—
Material—
Cup Diameter
Both mouthpieces have virtually identical cup diameters at 16.76 mm / 0.6598 in.
Cup Depth
The GR Technologies G66FD Radtke has a deep cup while the GR Technologies G66FL Radtke has a medium 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.