My preamp and the power supply are well seperated by two or three feet. (The power supply is on the bottom shelf and the actual preamp is on the fourth shelf from the bottom. I "think" that the umbilical cord is about 4 feet long or so. (Maybe longer. It is behind my rack and I can't really see it without tearing it apart.
(The quick answer is to email Ayre and ask, or put a post on Audio Asylum's amp/preamp board, because Charles Hansen checks that board fairly frequently.
As far as the HT setup, I don't think there is a HT pass through on the K-1, but I could be wrong. (I have no desire to integrate my HT with my 2 channel stereo.)
As far as Tboooe's comments:
Yeah, it is a bit noisey changing the volume, but that is because of the complicated, but properly done, volume control. Because of this design, the remote volume control has virtually no sonic affect on the sound. (I would rather it be done right, and be noisy, than have it be done incorrectly, and be quieter.) Besides, when I am changinf the volume, it is usually because I need to make drastic changes to the volume. A single click or so is hardly noticable.
Personally, I like the looks. Of course I have the silver face mounted now. (I actually have both a silver, and a black face, as the previous owner preferred the black face and paid for the second face.) But then again, I like the look of my Lamm M2.1s too. To mea, a simple design is very elegant, rather than something more garish. (Although, I must admit, I did like the Manley Neoclassic 250 amps in the gold finish that my friend had for a bit.)