Giardinelli 6VM vs GR Technologies 66M
The GR Technologies 66M has a wider cup diameter.
Mouthpiece A
Giardinelli 6VM
• Trumpet
Cup diameter16.70 mm / 0.6575 in
Cup depthMedium
Rim width—
Throat diameter—
Backbore—
Finish—
Material—
Best suited for
All-round versatile — balanced cup for general playing
vs
Mouthpiece B
GR Technologies 66M
• Trumpet
Cup diameter16.76 mm / 0.6598 in
Cup depthMedium
Rim width—
Throat diameter—
Backbore—
Finish—
Material—
Cup Diameter
The GR Technologies 66M has a cup diameter of 16.76 mm / 0.6598 in compared to 16.70 mm / 0.6575 in on the Giardinelli 6VM — a difference of 0.06 mm / 0.0024 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
Both mouthpieces share a medium 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.