The Def Tech BP2000TL's have built-in powered subs, don't they? A quick check of DefTech's site indicates that they are tri-wirable and have separate LFE inputs. I'm not sure what other DefTech owners do, but I would tend to go with speaker cable to the binding posts (don't think I would tri-wire them, but I might bi-wire and jumper the mid and high with a good scrap of speaker cable instead of the jumper bar) and then put a Y-splitter on the LFE output of the pre/pro and send the LFE to both speakers' LFE inputs. That way, the powered subs in each tower would be getting the LFE signal.

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Gonk