Those can be ticketed also. Just like saying I was speeding in a stock/factory car, so it's not illegal. See what the cop says when you tell him that LOLHow about how many FACTORY systems can be heard from 50'.....fight it.
OP knows he was playing it loud, so why is anyone on here disputing the 50' distance and trying to come up with technicalities. Go to court, pay your fine, and learn from your mistake.......