Me personally, I would suggest returning it. The reason being is that you are probably sensitive to the frequency that the device is putting out. I do not mean that in any sort of negative way, everybody is different. It comes from something called Misophonia.
As an example, there are some adapters when plugged in produce a vibration when electricity is run through it, and that vibration produces a noise that some people can hear and some cannot. I can hear it no matter where I am in the house, it drives me crazy. But nobody else in the house has any idea what I am talking about.
I listened to the streams you posted, and I did not hear anything. I only heard a low hum when I turned the volume up to 100, and put my ear against my speaker.