If I thought it would work I’d buy one like a shot:
The dilemma of the dancing grannies has prompted some to seek out tech solutions. One went viral online this week: a remote stun gun-style device that claims to be able to disable a speaker from 50 metres away.
Reviews of the item were positive. “Downstairs is finally quiet. For two days the grannies thought their speaker is not working!”, said one on Taobao, China’s version of eBay.
“Great invention, with this tool I will be the boss in the neighbourhood now,” said another. “This is not just a regular product, it is social justice!”
Can’t see how it could work. As in that old sci fi story (where the batteries explode) the energy requirement for cancelling noise over a wide area is pretty big.