Conn Connstellation 7BN vs Marcinkiewicz CH EF 21J. Cox
Both mouthpieces share similar core dimensions — the differences are in the details.
Mouthpiece A
Conn Connstellation 7BN
• French Horn
OrchestralCup diameter—
Cup depthVery deep
Rim width—
Throat diameter—
Backbore—
Finish—
MaterialSilver-plated brass
Best suited for
French horn players
French horn size 7; smaller cup; more compact tone; Narrow rim; smaller inner radius; sharper bite.
vs
Mouthpiece B
Marcinkiewicz CH EF 21J. Cox
• French Horn
Cup diameter17.48 mm / 0.6882 in
Cup depthVery deep
Rim width—
Throat diameter4.57 mm / 0.1799 in
Backbore—
Finish—
Material—
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
Cup Depth
Both mouthpieces share a very deep cup depth, so the sound character from depth alone will be very similar.
Material
The Conn Connstellation 7BN is described as Silver-plated brass, and the Marcinkiewicz CH EF 21J. Cox as unspecified. Material affects mass, warmth, and how quickly the piece responds.
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.