Looks like speakers a Rock group might use, but I wouldn't want to hear them. I believe those speakers are for voice only to blast their properganda to the poor
Used Korean Speakers
Has anybody heard these famous Korean speakers? I don't know what kind of amps you would need, and the wife acceptance factor has to be very low, but I'm intrigued.
http://www.euronews.com/2018/04/23/south-korea-turns-off-propaganda-speakers-on-north-korean-border
http://www.euronews.com/2018/04/23/south-korea-turns-off-propaganda-speakers-on-north-korean-border