The single input is very limiting. I may just use this amp in the guest room connected to a CD transport. I have a separate vintage Phillips tube stereo radio in there in case someone wants to listen to FM. Second thought, I recently disconnected the guest computer/monitor/HD tv from the Dish HD antenna. It just caused too many problems. I'm going to do a separate small HD tv in there with a DVD player, not a CD only, and that way they could play movies if they want to, or CD's and not risk messing up the computer. My wife and I don't have any movies. We're just not movie people but sometimes guests are, I suppose. They can go to the store and rent a movie. I did that once. I forget the movie. It was funny. I forget what it was about now.
Most guests use iPods. Shanling got a good review for their $999 music system, but I've been looking at several others less expensive -- the AudioEngine 5 has a built in amp and USB and it has received great reviews; also, the KingRex USB.
I collect vintage radios. I just bought an AM transmitter kit. Once I get it put together and "tuned" to an unused AM frequency we can hook it to out stereo and listen to our CD's or the FM tuner on any of the AM wonderful old radios in any room or out in the workshop or barn and get that great old tube radio musical sound.
I'd like to have an attractive "switch box" for the X-19. I think that's what I need. I found one (Google "Ampbox" and look around). If I had some schematics I could solder one together. I think that's what I need -- a box with a selector switch and RCA inputs for tuner, CD, a place to plug in a turntable phonoamp or headphone amp -- that outputs into the amp's single input.
Jolida sells a nice "Remote Control" platform. The amp plugs into the platform which is controlled by the RC. All it does is "on-off", but that sure beats getting out of bed.
However, I don't want to overlook the fact that this sounds like it is going to be a very nice first product and I don't want to distract from that. I'm sure many more good products will follow and I'm eager to read about them and perhaps have useful input as they are going through R&D.