[raverbashing]

Yes, but at which frequencies, power and more important, acoustic coupling with the skull?

[gm-conspiracy]

Check out "parametric speakers".

Amazon has an assembled kit for sale: http://amzn.to/2AxtPBS

Also, more info from soundlazer.com, here: http://www.soundlazer.com/what-is-a-parametric-speaker/

Also, reminds me of the MacGyver (original) episode "Soft Touch"- where a Columbian drug cartel tortures a federal agent in a garage using high-decibel noise.