The Hartford municipal noise ordinance is what it is. But I don't think it is meant to be used to prosecute every time the noise limits are broken but rather to give the police and city prosecutors the law if it is needed. When OP and his friends are warned twice to quiet down or the police will be called, that should have stopped the loud noise. That doesn't mean that nobody speaks but it puts them on notice that if it continues to disturb the neighbor, the police will be called. And they could be ticketed and perhaps prosecuted.