Audio Research LS 16 tube preamp-has built in pass through. Newest edition is Mark II. I got mine (Original edition) used and am very pleased with it. Reviews can be found at www.ecoustics.com and audioreview.com.
I know this may be a dumb question, but I'm very interested in finding out how what's being discussed here would be done - I, too, am interested in creating a quality HT/Music system... In short, would the quality pre, discussed above, pass-thru an analog or digital signal? I ask this since it seems that most proc'rs are best when used with digital inputs, and that most quality pre's deal mainly with analog... or am I mistaken?