I am also interested in hearing from the pro's on this subject. I'd like to run outdoor patio speakers off of my main system in the living room. To do so, I would have to run about 25-30 feet of speaker cable through the wall to my amp. I have heard of and seen pictures of an Adcom speaker selector, but don't want to mess-up the signal on my main system. Don't know if the Adcom would do so.
The alternative for me would be to move the office streamer and Dac/pre to the patio and use powered speakers with 10 feet of rca cables and 10 feet of a single speaker cable. I have an Ethernet connection on the patio but, would have to move the system inside whenever it rains. Not my first choice.