What is the difference between Legacy lnb and Dish pro lnb?
Quick synopsis: Both support up to four receivers, but the Legacy will work with any Dish receiver ever made, while the DishPro will support the DishPro 3xx/5xx/6xx/7xx/8xx/9xx receiver models. The older, four-digit models need a DP adapter to work with the DP LNBs. Electrically, the Legacy LNBs use a 13V/18V voltage switching to determine which group of transponder channels are sent back to the receiver, while the DishPro LNBs send both sets of transponders at the same time, one group at a higher frequency than normal.