Yamaha HR-33B vs Yamaha HR-34C4
the Yamaha HR-34C4 features a deeper cup, the Yamaha HR-34C4 has a larger throat opening.
Mouthpiece A
Yamaha HR-33B
• French Horn
Cup diameter17.87 mm / 0.7035 in
Cup depthShallow
Rim width—
Throat diameter3.90 mm / 0.1535 in
BackboreSemi-wide
Finish—
Material—
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Yamaha HR-34C4
• French Horn
Cup diameter17.88 mm / 0.7039 in
Cup depthMedium
Rim width—
Throat diameter3.98 mm / 0.1567 in
BackboreStandard
Finish—
Material—
Best suited for
High-volume projection — open throat for power
Cup Diameter
Both mouthpieces have virtually identical cup diameters at 17.87 mm / 0.7035 in.
Cup Depth
The Yamaha HR-34C4 has a medium cup while the Yamaha HR-33B has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.
Throat Diameter
The Yamaha HR-34C4 has a wider throat (3.98 mm / 0.1567 in vs 3.90 mm / 0.1535 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.