Which speakers are you using please? It is often simpler to link the Core as an input to the 7000 via the Tape socket and connect the speakers to the 7000.
Please feel free to email me and I can help with the best option for your needs.
Kind regards, Steve
Location: The cable workshop, EnglandFavourite Product: Beosystem 72-23Signature: Cables, friendly advice and great ideas for connecting Bang & Olufsen! Ask any questions at https://soundsheavenly.com to get the best from your B&O! Please visit my B&O YouTube channel at https://www.youtube.com/soundsheavenlycablesMy B&O Icons: