It Works!! Thanks All!
...2 different subs work, but they need to be placed properly. Try putting the Infinity behind or near the couch, and the Velodyne in a front corner. SheepStar
Got the Y splitter...messed with a hundred combinations of crossovers, placements, and volume adjustments and in the end Sheep's suggestion worked best! The larger Sub is next to the TV and the smaller one is close to the couch. Interestingly the "sweet spot" for the one by the couch is perpendicular to the one by the TV and set against the wall just behind the couch line.
Volume with the smaller can be set lower so it doesn't crash when the system volume is higher.
Lesson for me - when it comes to dual subwoofer placement the 3 most important things are: location, location, location.
My system now:
Samsung DLP 61" 1080p TV, Denon 887 Receiver, HD VIP622 DVR Satellite Receiver, Sony Blu Ray BDPS301, Toshiba HD-A2 HD DVD, Klipsch Quintet, Two Rear Polk speakers, Harmony Logitech 880 Universal remote, Velodyne DPS10 Subwoofer and finally...
...an Infinity PS8 Subwoofer.