Yamaha HR-28B vs Yamaha HR-32B
The Yamaha HR-32B has a wider cup diameter.
Mouthpiece A
Yamaha HR-28B
• French Horn
Cup diameter16.87 mm
Cup depthShallow
Rim width—
Throat diameter3.90 mm
BackboreSemi-wide
Finish—
Material—
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Yamaha HR-32B
• French Horn
Cup diameter17.67 mm
Cup depthShallow
Rim width—
Throat diameter3.90 mm
BackboreSemi-wide
Finish—
Material—
Best suited for
High-volume projection — open throat for power
Cup Diameter
The Yamaha HR-32B has a cup diameter of 17.67 mm compared to 16.87 mm on the Yamaha HR-28B — a difference of +0.80 mm. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
Both mouthpieces share a shallow cup depth, so the sound character from depth alone will be very similar.
Throat Diameter
Throat diameters are essentially identical at 3.90 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.