Let's suppose this hypothetical situation occurs in a town with noise laws, and that the noise coming from the house is illegally loud for the circumstances.
I'll start by changing the hypothetical situation: no one is at the door or outside.
OK, so the police get a complaint. They walk up to the door and knock. They hear loud music coming from inside the house that is obviously illegal for the circumstances. They walk around the outside of the house, peering in, and do not see anything else illegal.
In such a situation, although the police have probable cause that a crime is being commited, they are nevertheless not allowed to enter the home. The tenant is not required to answer the door. The police may go away and get a search warrant, however.
Considering that hypothetical situation, you can see that having someone answer the door can only make the situation worse for the partygoers. The police may claim that the doorman gave consent to enter.
It might be clearer to post a notice on the door such as, "This is a private party. We will not answer the door. If you have any concerns, please telephone Bob at 555-1234." And if the police do phone Bob, Bob might want to audiorecord his end of the conversation.
It would also be good to research noise laws and other laws, and make sure the party is conducted legally. Keep in mind that if you host a legal, annoying party, that would invite confrontation, so you should be ready for such a confrontation, with the idea of legally preserving a recording of the encounter.
It might be simpler to just rent a hall someplace where parties are normally held.

