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Power supply 5V/2A whistling

Hello,

I bought the "Power supply 5V/2A EU plug" on Hifiberry web site.

RaspberryPi and DAC + PRo word well, but the power supply plug is noisy.I hear a whistling sound when it is plugged.

I used an app on my phone to analysed this sound (Advanced Spectrum Analyser PRO), when I put my phone near the power plug, an high frequency sound is visible. You can see the screenshot.

https://drive.google.com/file/d/0B3Ckrg-ZBaPoR3l3TXliekN0X00/view?usp=sharing

Is this whistling is normal ?

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