Thanks guys - but I'd seen that diagram. What I was trying to establish is whether that is the "normal" diagram, or the "AV9000" diagram. I also don't want to go and buy an normal cable if I need a special AV9000 one.
Where I'm trying to get to is to work out what I need to do in order to make an AV9000 audio kit work with an Avant. I suspect that it's just a matter of implementing the right power supply. Unfortunately, I can't find a service manual for either an AV9000 or the audio kit on beoworld.
Of course it's possible that there's a bigger problem than just the power supply, but I won't know until I try...
Mark