Interference on desk speakers?

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I've tried Googling this, but can't come up with a sensible response. Ergo, I turn the issue over to you guys

I recently got a little pair of desk speakers, for when I'm working my heinous Sunday shifts and want to watch stuff on iPlayer (or whatever) without my headphones on (in case anyone is sneaking behind me )

Trouble is, whenever the NIC does anything "worthwhile" (sending and receiving email mainly) I get a horrible crackling interference noise over the speakers.

I have a Dell 520 and a USB Toshiba Dynadock (which runs my second monitor). I have tried the speaker in this, direct into the (onboard) soundcard, and in the headphones jack at the front of the box.

Err... any ideas how I can stop the bugger? It's doing my block in...

 

The speakers are about a foot and a half away from my PC's ethernet port, and my VoIP phone. Because of the tight cable management on the desk (lovely looming and looping) that's about as far away as they get unfortunately...

 

Maybe the set of speakers are unshielded?

-Ken