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Students’ Leaf Blower Suppressor To Hit Retail
(hackaday.com)
This is a most excellent place for technology news and articles.
They do the same thing with vehicle air intakes to eliminate annoying sounds and make the car sound more throaty. Don't forget about cars that have engine noises come through the stereo. People think they need to "feel the engine" in order to drive. I would rather it be completely silent, not that's not possible because of tire noise.
Luxury sedans have done a damn good job at shutting out road noise for a long time now, but there are obvious (and less obvious) costs associated with that.