My current setup is a 722, 510 and a 311. I want to replace the 510 and 311 with another 722. Do I need to update my switch? I have a DP34,Twin(1), Twin(2) and Dual(3).
Nope. But you'll need to run two cables from the switch to the new 722 receiver. The DP34 gives you 4 outputs and you'll be using all 4 outputs with two 722s.