I don't think that kind of law enforcement was being carried out in the U.S. in the early to mid 80's, Glue.

The 90's are a different story tho... Because of car stereo systems, if your music could be heard 100 (?) feet away, you could get ticketed in Philly.

I've never seen police handing out tickets tho 'cause cats would just turn the volume down when they drove by and turn it back up when they were out of sight.

By then, boomboxes were already out of vogue.
As for the '84 thing... I didn't see big 1-peice boxes start disappearing from electronics store windows - not talking about the big name companies, but Mom & Pop shops - until about '89/'90.