The IE 7 power cord is a little suspect IMO. Since when have you seen anything other than cheapo round wall wart power for devices like this?

"A single transmitter is capable of driving up to 4 receivers using either 4 individual wire pairs over 300 m each, or by daisy chaining the receivers"

So if i daisy chain receivers i can transmit a source to 4 receivers using 2 wires of "any" type? You better test this before you spec it for a project lol.