I used sound waves to make espresso. It could cut coffee-brewing energy use by 75%
(theconversation.com)
An edit to my post got lost in the aether as I entered a dead zone at work, on reflection it is cool tech.
I'm skeptical about inviting more tech into the home for something so simple in this day and age of subscription services and lack of repairability, but if it makes a better cup of coffee, I'd try it.