Short and Simple question to Nokia BH-503 BT Stereo Owners. Please help

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Hello,

I just got my BH 503.

I am fairly satesfied but there is one thing that worries me.
When I pair the headset with my xperia and I pause the music playback for a second and listen closely I hear a very very shallow and distant high-pitched sound in the background that fades away once I have paused for more than 3 seconds.
It appears that the BT module inside the Headset is making this noice while it receives data.

Can you please check if you hear the same noise when you pause music playback for a second?
While playing it is also there only that you cannot hear it because the noise distracts you.

Thank you so much

Do you have any equalizers installed like SRS etc? I have 2 headsets that make the same noise when SRS is installed. None of them are Nokia though