If cops were to arrive at your door simply keep the noise down, lock your door handle and step outside with them .. If you leave it unlocked they may walk in and you cant do anything to stop them. If its locked on the other hand ... Talk to them outside, the worste they are going to say is keep the noise down we got a complaint blahblahblah. They might ask if theres alchohol and if anyone there is of age, make sure someone is of age ......