I finally hooked up my FiiO X-1 to the home theater. I played some of my 96/24 wav files from HD Tracks. For the record, I had listened to these same files from my PC using my M-Audio sound card and a 25' RCA cable.
The sound quality was similar, but the music from the FiiO was a bit smoother.
The only drawback was the fact that I had to turn the volume on the FiiO up to 100%, which reduces the battery charge much more quickly than if I played it at about 63%, the volume I set for my headphones. BTW, this is using no EQ.
As for the cable, I used a basic Hosa Y. They have been very reliable for me.