GR Technologies 66M vs Monette AP1-5 S3
The Monette AP1-5 S3 has a wider cup diameter.
Mouthpiece A
GR Technologies 66M
• Trumpet
Cup diameter16.76 mm
Cup depthMedium
Rim width—
Throat diameter—
Backbore—
Finish—
Material—
vs
Mouthpiece B
Monette AP1-5 S3
• Trumpet
Cup diameter17.00 mm
Cup depthMedium
Rim width—
Throat diameter3.66 mm
Backbore—
Finish—
Material—
Cup Diameter
The Monette AP1-5 S3 has a cup diameter of 17.00 mm compared to 16.76 mm on the GR Technologies 66M — a difference of +0.24 mm. 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.