I don't know how your speakers are setup but in America most electronic things must except the interference of blah blah blah... Basically certain sound equipment will pick up truckers radios and sometimes police radio as well. So that could be where it comes from.
I've had it happen before and it is definitely freaky..
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i can hear some random speech and music coming from my speakers, but there is no vent/TS or ANY other programme open
wtf is goin on?????????
Actually, I get it too, I have the Logitech x-350 surround sound, and it sounds like the radio, it happens when I have the sound less than 1/5th of the way turned up. It creeped me out for the first month or so, but now, I don't care...
They pick up german, french & even russian...& I live in the uk >_> It's weird, but eNsLaVe told me a possibility what could be wrong. He said it's possible that the tracking & various other components may be to close together on the sound card, creating a capacitor -which i what is used to tune AM radios.