Which means that the burden is on the defendant to prove that his noise level did not exceed 45db in the neighbor's apartment.
There are many decibel level charts on the internet and almost all rate conversational speech at 3' at 60 db.
Imagine 9 people in an apartment, likely all in the living room, having several conversations, each speaking louder than normal just to be heard over the din of the other conversations and you can easily exceed 45db if measured in the neighbor's apartment and maybe 70 to 80 in the OP's apartment.
Ditto.

