Wow, are you ever getting every possible answer, only in a lot of bits and pieces. Let's see if we can straighten this all out.
As you will have gathered by now, you will at the very least need a power amplifier attached to the PowerLink(8-pin socket) on the BS-9000. Here you have two options, the B&O way, and third party. If you go B&O, then you will, indeed, need the fully wired (MKII) PoerLink cable, and the 2-pin speaker adaptor, as well as the ML-MCL Converter, which is a 60 watt amplifier. If you go 3rd party, then you will need the DIN-RCA adaptor (6270302), and a setof RCA cables long enough to reach the 2-channel power amplifier of your choice. As mentioned elsewhere, you will need to force the 9000 into Audio Option 1.
If you already have a nice stereo or surround receiver which you are just dying to keep, then you will want to attach the 9000 to the DC input on that device. To do that you will need a 4-RCA to DIN adaptor. These are harder to get (at least here in the US), but you can get one through B&O. You will plug the adaptor into the AUX socket (7-pin) on the 9000. You sill spend 5 minutes figuring out which RCA pair is the output pair. You will need to force the BS-9000 into A-Opt. 1. The 9000 will act lie it ought to, but the non-B&O receiver will be in charge of volume, tone, and balance, just like for everything else plugged into it.
All of the other suggestions (some of them fine), are just noise at this point. The Headphone jack gets you nothing that the PL socket doesn't provide, except for a little more noise, I am not aware of any ML-to-Line level adaptor, and unless you're doing a multi-room setup, there is no need to get any more complex than the 2 solutions above.
Let me know if there are any other questions.
Russ
We kid because we love.
Bang & Olufsen Tysons Galleria
McLean, VA USA