GR Technologies 66M vs Marcinkiewicz CH 13
The GR Technologies 66M has a wider cup diameter, the Marcinkiewicz CH 13 features a deeper cup.
Mouthpiece A
GR Technologies 66M
• Trumpet
Cup diameter16.76 mm / 0.6598 in
Cup depthMedium
Rim width—
Throat diameter—
Backbore—
Finish—
Material—
vs
Mouthpiece B
Marcinkiewicz CH 13
• Trumpet
Cup diameter16.31 mm / 0.6421 in
Cup depthVery deep
Rim width—
Throat diameter3.66 mm / 0.1441 in
Backbore—
Finish—
Material—
Cup Diameter
The GR Technologies 66M has a cup diameter of 16.76 mm / 0.6598 in compared to 16.31 mm / 0.6421 in on the Marcinkiewicz CH 13 — a difference of 0.45 mm / 0.0177 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
The Marcinkiewicz CH 13 has a very deep cup while the GR Technologies 66M 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.