Is there a way to turn off centerchannel? so it will be heard in main speakers

I have a 7.1 system in my homecinema, but have no need for the center anymore. Rpi3 and letting Kodi put out 7.1 channel audio PCM via HDMI, , so In Audio settings there is only 5.0, 5.1, 7.0 and 7.1, but no 6.1?

Is there a way around it?

In my Pioneer Receiver I can turn off the centerchannel, but then the dialog (center channel) sound will be missing, no sound when they are talking.

I have no speaker setup in my Pioneer Receiver wich I can choose my AVR to let the center channel sound go to the main speakers. So I was hoping kodi could do that for me?

ok, thanks, no problem . I solved it by setting in my AVR.