My current setup is 3 - 301 and 1-501 DVR receivers. Dish and LNB's are from original install in 2000. I know i have the Dish 500 dish and quad switch. With all the recent problems with the 501 locking up and rebooting, i am considering upgrading my 501 to a dual tuner 625 dvr using the dish n it up program. I am using all 4 feeds from the dish so is it possible to create a 5th feed to allow both tuners in the 625 to be utilized?