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
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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External, is a loop for your Marantz, not any of the sources. The source(s) all of them, will stay hooked to the Marantz, you use the "External" on the Mac and they will play through the Mac.

SQ, use the Mac, just a much better preamp for music...Using TWO HT preamps and a (7 wire source) and a la te da.... you really like wire? lol You can get all the stuff to work, I just don’t understand, why TWO? HT other than you like the SQ of the Mac, and 4K. 

I just don’t see you writing, it sounds better this way or that, just, "how do I hook it up"? SQ is what your after, right?

The Mac will sound much better. The Marantz, is budget stuff, but for HT, what do you want? 4k 5k 10k, 20k...

Stereo... I came from the mono era into stereo... 4K.. LOL

Regards