Yamaha HR-29D4 vs Yamaha HR-30D4
The Yamaha HR-30D4 has a wider cup diameter.
Mouthpiece A
Yamaha HR-29D4
• French Horn
Cup diameter16.88 mm
Cup depthDeep
Rim width—
Throat diameter4.50 mm
BackboreSemi-narrow
Finish—
Material—
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
vs
Mouthpiece B
Yamaha HR-30D4
• French Horn
Cup diameter17.08 mm
Cup depthDeep
Rim width—
Throat diameter4.50 mm
BackboreSemi-narrow
Finish—
Material—
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
Cup Diameter
The Yamaha HR-30D4 has a cup diameter of 17.08 mm compared to 16.88 mm on the Yamaha HR-29D4 — a difference of +0.20 mm. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
Both mouthpieces share a deep cup depth, so the sound character from depth alone will be very similar.
Throat Diameter
Throat diameters are essentially identical at 4.50 mm, so resistance feel will be comparable.
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.