I own the DD12 myself but I am using the MX135 which allows me to use only one connection to the DD12. If I read your question correctly I understand you basically have two systems in which you wish to incorporate the single sub. If you only have one set of speakers, I think your best safe solution would be to run the stereo speaker pass thru connections on the DD12 and use the Pre-Pro sub out directly to the sub input on the DD12. Then use one of your 6 presets and designate it for the stereo setting when you use the Mc side of the system. I can tell you once you get all the settings dialed in on the DD12 you will love it. I have been using mine for about 18 mos. now and would only consider trading the 12 in for 2 -10s. Otherwise I am there as far as subs go.
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