Giardinelli J4 vs Giardinelli J6
the Giardinelli J4 has a larger throat opening.
Mouthpiece A
Giardinelli J4
• French Horn
Cup diameter18.00 mm / 0.7087 in
Cup depthDeep
Rim width—
Throat diameter5.30 mm / 0.2087 in
Backbore.209"
Finish—
Material—
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
vs
Mouthpiece B
Giardinelli J6
• French Horn
Cup diameter18.00 mm / 0.7087 in
Cup depthDeep
Rim width—
Throat diameter5.20 mm / 0.2047 in
Backbore.204"
Finish—
Material—
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
Cup Diameter
Both mouthpieces have virtually identical cup diameters at 18.00 mm / 0.7087 in.
Cup Depth
Both mouthpieces share a deep cup depth, so the sound character from depth alone will be very similar.
Throat Diameter
The Giardinelli J4 has a wider throat (5.30 mm / 0.2087 in vs 5.20 mm / 0.2047 in). A wider throat allows more air through, increasing volume and projection but reducing resistance.
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.