high frequency intermittent noise

It sounds like cheap computer noise.
Are you using a computer as your source?

@fusian  

I am not using a computer as my source.

I tried the ferrites and they had no affect on the noise.

I got a set of Sony WH-1000XM2 Bluetooth headphones and I can hear the noise very faintly in my headphones in my apartment.  So now this verifies that the noise is air borne and not from my power mains.

Thank you all who participated in this thread. 

Man, that sucks. Time to move!

Thanks...unfortunately a move is not in my playbook at this time.  The noise is not very noticeable once music is playing.  Only when there is no music playing then it becomes noticeable.  So, it's tolerable for now.

Hey, that's impressive use of perspective. Plenty of members on here are so OCD, they'd be miserable and only able to hear the noise.

I was that way with transformer hum, until I decided not to care

It's all about the music...once the needle drops...I'm very happy.

I was on a quest to solve the noise (which I have lived with for some time) and in the process, I resolved a ground loop issue, and inserted an isolation transformer which really did solve a lot of noise from my power mains.  So the system sound has been elevated, just not 100% dead quiet like I would prefer when sitting right up next to the speaker listening for noise.

Time to move on to the next weak link...👍🏻

if you are in NYC, you do what some sports car owners do - have a site outside the city where it is kept and subway out to it for a drive (or in your case, a listen)

a place in the Catskills could contain your most sensitive equipment and something else used in the city