Speakers and Video

[Perquacky]

I have looked through the forums and could not find this. I broke down and bought a HTiB and it talks about how it is 1080p compatable. Why would the speakers need video? Normally, I would think, you would put the HDMI output from the blu-ray player into the input to the speakers. Bam, done. But in the manual, it says to then get another HDMI cable and put this on the output on the speakers to the TV. I just dont understand why this is and why 1080p would have anything to do with speakers. The only thing I can think of is it would then switch between the TV and Blue ray automatically. But if I only want the speakers to play on my blu-ray player and use the TV speakers for watching TV can I just use the one cable to teh player? Thanks.