Mac Mini chirps - connected to home theatre

I have a Mac Mini, mid 2010, that I use as a media server and it's connected to my home theatre. It currently runs Mac OS X v10.9.5 and as long as I've had it, no matter what version of Mac OS, there's an occasional chirp. It sounds like the first note of a wolf whistle. The sound comes over the sound system and only occurs when playing iTunes Internet radio. I don't recall ever hearing it while listening to any of my own music and I have a huge collection.
I've turned off notifications for almost everything, thinking it was perhaps a notification causing the problem. Strangely, I still get notifications of what song is playing on the Internet radio station but I've not heard the chirp when I saw a notification display.
For what it's worth, I usually use my MacBook Pro to control the Mac Mini via screen sharing. Also, because of the large collection of media, I have a 3 TB hard drive connected that I designated as the location of my iTunes library.
This a quite annoying and thank heavens it doesn't happen while watching movies via iTunes directly or through my Apple TV.
I've read some threads on this site that suggested HD problems but that's highly unlikely in this case since the sound comes over my home theatre system speakers and I've absolutely no issues with the Mac Mini's operation. Since the demands aren't high for the Mac, given it's use, I don't in
Any thoughts?

How connected? If HDMI and some other ways then you have to use TV's volume control

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