ST1100Y
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Correct...Complicating things is that helmets are tested in a wind tunnel with just clean air hitting them.
Just had to "service" my Neotec II to fix a noise issue...
On motor-ways (>140kph/85mph) and face-shield closed, the slider of the top-vent started to vibrate...
Even with earplugs that "....dr-r-r-r-r-r-r-r-r..." got pretty annoying on longer stretches...
Standing up, exposing the lid to full front air-flow and the noise instantly calmed...
Anyhoo... downloaded the manual and unclipped the vent-slider as shown there, added a custom foam strip & some silicone grease to fix it...