Loud tenant, no neighbor complaints
What would you do in this situation? We are house hacking a 4 plex and have one tenant who once a week or so plays music loudly, with (I assume) a subwoofer. They are on the top floor of a duplex, so they share a ceiling/floor with another tenant. The tenants below them have not complained. I don't think the sound of the music is coming in but I'm certain they are hearing some of the bass. We only know about this because we live on site; we would have no clue otherwise because they haven't said anything to us.
I'm torn on saying something when there isn't a complaint. What would you do in this situation? Our instincts are to address the issue if the music becomes an obvious issue or if the other tenants complain.