Hi Lars,
Sorry for the delay in responding to this thread, as I've been very busy in the last few days. Your Tandberg speakers need an amplifier to connect them to any modern B&O equipment, this can be done easily using a conventional hifi amplifier.
Connect a "Powerlink to RCA Adapter Cable" to one of your Powerlink sockets on the Ouverture and then into a line or tape input on the amplifier. Then connect the Tandberg speakers into the speaker sockets of the amplifier.
If your Aux socket is in use connecting the Ouverture to your MX7000, then you may be best to use an FM wireless transmitter to send your iPod sound to the Ouverture, otherwise you could connect this into the MX7000 using an iPod to SCART cable and this can then be switched to either the TV or audio system speakers as required. The lack of spare input sockets on the Ouverture is a common issue!
If you need any assistance in locating the correct cables, please just ask, or click my sponsor link at the foot of this page.
Best regards,
Steve.