Añado mas información, sacada de las FAQ de Marantz USA, aunque no es específica del modelo SR6008

"I want to run a 7.1 plus Zone 2. Can I do that with this receiver?

Yes you can. However, you will need an additional external amplifier. Most of our receivers have 7 amplifier channels built in and if you're using all 7 for your Main Zone, you will need to connect an additional power amplifier via the Zone 2 pre-outs (analog red and white audio jacks)for audio output to an additional zone."