Surprised Ernie didn't point out how he did NOT give us a part number on the connecting block. They have 4 output ones, 6 outputs ones, 10 output ones.  And they make some that are amplified.

I think we are all assuming he is using a 789-44. Except Brent seems to be thinking one of the powered blocks, since he mentioned putting power on both blocks. Which is not done if you use 789-44, since those are strictly passive devices. Power is only supplied on those, to pass to the IR receiver.