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
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. 
I already have two Oppo’s 83 and 103d. If I buy another component my wife would kill me. I just upgraded my entire HT. 
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