Marcinkiewicz CH EF 21J. Cox vs Yamaha HR-29B
The Marcinkiewicz CH EF 21J. Cox has a wider cup diameter, the Marcinkiewicz CH EF 21J. Cox features a deeper cup, the Marcinkiewicz CH EF 21J. Cox has a larger throat opening.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Marcinkiewicz CH EF 21J. Cox
• French Horn
Cup diameter17.48 mm / 0.6882 in
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
vs
Mouthpiece B
Yamaha HR-29B
• French Horn
Cup diameter17.07 mm / 0.6720 in
Best suited for
High-volume projection — open throat for power
Cup Diameter
The Marcinkiewicz CH EF 21J. Cox has a cup diameter of 17.48 mm / 0.6882 in compared to 17.07 mm / 0.6720 in on the Yamaha HR-29B — a difference of 0.41 mm / 0.0161 in. A wider cup generally produces a fuller, darker tone but requires more air support.
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.