GR Technologies E62FD vs GR Technologies 64FD
The GR Technologies 64FD has a wider cup diameter.
Mouthpiece A
GR Technologies E62FD
• Flugelhorn
Cup diameter15.75 mm / 0.6201 in
Cup depthDeep
Rim width—
Throat diameter—
Backbore—
Finish—
Material—
vs
Mouthpiece B
GR Technologies 64FD
• Flugelhorn
Cup diameter16.26 mm / 0.6402 in
Cup depthDeep
Rim width—
Throat diameter—
Backbore—
Finish—
Material—
Cup Diameter
The GR Technologies 64FD has a cup diameter of 16.26 mm / 0.6402 in compared to 15.75 mm / 0.6201 in on the GR Technologies E62FD — a difference of 0.51 mm / 0.0201 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
Both mouthpieces share a deep cup depth, so the sound character from depth alone will be very similar.
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.