I would just use the pre outs to the sub and leave it at that. Use the subs internal Xover to set filtering. No nee to run cables form sub out back to the receiver.
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Since the 1050 has two pair of speaker terminals it would be very simple to run a second pair of speaker cables to the high-level inputs of the sub. They don't need to be as large as your main speaker cables since they're carrying just the frequency and amplitude information and very little current.
I found it easier to integrate an HSU sub using the high-level inputs rather than the low-level and that is the method HSU recommends.
thank you all for the input. Like I said, I'm just getting started here and everything is new to me. I'm going to visit the local shop and see what they have to say. The system is going to be the Rotel Rx-1050, Rotel RCD 1072, some monitors (either B&W 685s or something comparable in that price range) and a fathom f112.
Thanks again for everyone who chimed in!