Help connecting a receiver to my McIntosh MX136 preamp


I would like to know if I can connect my Marantz SR-6008 receiver to my McIntosh 136 pre so I can have 4K pass through from my Marantz for my 4K Sony tv. The problem I have is the pre out from the Marantz uses 7 analog ports, but I’m already using the 7 analog inputs from my Oppo for sacd music. Any input would be appreciated. McIntosh MX-136 pre
McIntosh MC-7205
McIntosh MR-7082 tuner
Oppo 103D dvd player
audio technics LP-120 at usb turntable 
Polk Audio RTi A9’s front
Polk Audio RTi A6 center
Polk Audio TSi 500 surround 
Polk Audio TSi 100 surround 

cody57
One component I left out, just got it. Bluesound Node 2i. Which will bring the Mac up to date for streaming music. 
  1. I saw the external ports, but they are used by the Oppo for multichannel music sacd and DVD-Audio. I have a digital coax cable from the Oppo to the Mac136 pre for dvd movies. In order to get 5.1 or 7.1 from sacds, would the coax cable work or does it need the analog rci’s for multichannel music?  I thought I could connect the Marantz to use the 4K pass through for when my 65” Panasonic plasma quits, I can bring my Sony 4K tv upstairs.
I saw the external ports, but they are used by the Oppo for multichannel music sacd and DVD-Audio.
IF you want to connect the Marantz SR-6008 receiver pre-out to your McIntosh MX136 external inputs, just connect the Oppo 103D to Marantz SR-6008 "7.1CH IN" instead. 
That’s true, but I’d need to play the multichannel sacd’s through the Marantz also, instead of the Mac, right?  I listen to a lot of sacds. I may just have to do it that way. Thanks for the tip.