Thanks Rick and Ken,
Rick, That is what I would do, however, locally I"m not sure where I can get a similar cable like my blue jeans sub cable for cheap.
I like Kens idea to just get a cheap RCA to RCA cable, I'll have to look around. It would not have the same thickness or insulation as my bluejeans cable, but should do a good job for testing to find the prime sub location in my room.
Can't wait to lift the 600 around.
Actually, I may just put it in the prime location and just move my SPL meter around while using RoomEQ software to plot more graphs.