Former long time renter here. I had the same problem with neighbors in an adjacent apartment complex, and police couldn't do a damned thing except come out at 4 am and tell me, yep, we can hear that from the street.

I mentioned the problem to the landlord. The landlord told me to report it to the public health department. I did.

I never heard back from the health department, but the noise stopped within a few days, and the stereo blasting tenant and their onsite manager glared at me ever time I saw them afterwards.