In Canada... sound violations are a city by-law unless its caused by a car.

So in this case, they're breaking part of the highway traffic code.

Where exactly are they doing this? If its in front of your house then go and tell 'em off.

"Sound offs" are supposed to be done at comps where they have calibrated mic's and are setup to actually have a REAL bass race.

Try slayer really loud, it usually scares off the hippies and the rap fiends.