Hi
Congrats with your new speakers :o) they are just awesome.
How did you connect it on the BL5 ? there are several ways to connect the BL5's I guees that you also got the manual together with the speakers?
You can still use the powerlink if you use it together with a surround set up also, but you still need both the Digital cable and the Powerlink cable.
Here is one way: Put the Power Link cable between the TV and BL5 and the Digital SP/DIF(remarks don't use analog LINE IN) between BL5 and your Audio center I know it works with a BS9000 and then masterlink between TV and audio setup. Remember to set the left/right switch correct on the back of BL5. And defalut the speakers are in Option 0 so look through the user guide how to set this up also.
Remember this.! the BL5's fools your brain to think that your not playing that loud at all - and you can easily take your self turn it up to loud, you will know if your have played it to loud, when your of to bed at night :o)
Hope this helped you
Regards
Anders