This is probably noise from the PSU and processor inside the samsung. In a headphone you won't hear this but the sensitive input of active loudspeakers like BL4 can pick it up from a TV headphone output and amplify it.

You need an attenuator in between the TV and the BL's. You can

a) build it yourself: link

b) use a headphone volume control, eg

Thanks alot. I bought that headphone volume control and it worked. Kind of. I now have it set to as low as i can (1/10 maybe), and the humming is nearly gone. I can still hear it when i put my ear close to the speaker. Only problem is that i now have to set the tv volume really loud, but i think i can live with it. It kind of bugs me though that i have this kind of problem, with speakers this expensive.

"It kind of bugs me though that i have this kind of problem, with speakers this expensive"

Are you for real???

Blaiming b&o speakers to be bad and expensive then you have buy a cheap tv without proper line out ?????

Um, no. That's not what i was trying to say really. It just bums me that i have a great pair of speakers (yes pretty expensive too) that i am not able to use properly for whatever reason.