TBH they're wasting a lot of the volume by having it boot mounted, seems a bit silly.
Plus I think their driving about the streets regularly blasting people for no reason at all is irresponsible and dangerous. I'm not sure what sort of a person thinks cruising up behind an old man struggling to cross a busy street, then blasting him with 150db is funny. Plus if it was in my neigbourhood that he was doing that I'd gladly drag him from his car and beat him senseless, I'm already pee'd off at the number of local mums that drive around our area beeping at each other to say hello.