[SpaceBar]

From the brief description, I suspect powerful subsonic transducers clamped onto water pipes or structural members and perhaps tens of kilowatts of acoustic energy pumped in. You would feel it, but not hear it, and it would have distinct nodes and antinodes depending on how it was ‘tuned’.

[blueplum]

ok, sounds good as anything. What about hypersonic? (scroll to the bottom of the article to get to the summary of brain effects)

Inaudible High-Frequency Sounds Affect Brain Activity: Hypersonic Effect
http://jn.physiology.org/content/83/6/3548

[The Westerner]

Didn’t know Antifa was in Cuba. Or perhaps Cuba trains Antifa?

Obviously these are purposeful acts of war. Permanent hearing loss is inexcusable. The United States ought to bring these “diplomats” home! What is taking so long?

[Moltke]

perhaps tens of kilowatts of acoustic energy pumped in.

10s of kW sounds unlikely. Here are some examples of sound power:

Situation and
sound source 	                   Sound power(W) 	

Saturn V rocket 	           100,000,000 	

Project Artemis Sonar 	           1,000,000 	

Turbojet engine 	           100,000 	

Turbofan aircraft at take-off 	   1,000 	

Turboprop aircraft at take-off 	   100 	

Machine gun
Large pipe organ 	           10 	

Symphony orchestra
Heavy thunder
Sonic boom 	                   1 	

Rock concert
Chain saw
Accelerating motorcycle 	   0.1 	

Lawn mower
Car at highway speed
Subway steel wheels 	           0.01 	

Large diesel vehicle 	           0.001 

Loud alarm clock 	           0.0001 

[Bryan24]

Would be interesting to see if it was:
- highly directional
- low frequency
- multiple transmitters
-out of phase

transmissions.