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@740carver Very Interesting Question, and this response is only focused on the original question of which 4000 to buy. For a few months I was able to listen to the handy work, and the magic it produced when Nelion restored a very early version of the 4000. I just wish that I had spent the time to read the manual in detail to find out what the full capabilities were. Download the two manuals that are available on this site if you haven’t done it already. The 4000 has the Time Delay; Ambience Reproduction System, whereas the 4000t has what the manual calls a Digital Time Lens. The Time Delay; Ambience Reproduction System, has 20-watt amp(s) built in that can power “small speakers” scattered around your room. The explanation of this offering in the 4000 covers about 5 pages starting on page 24 of the 4000 manual. A special note on top left of page 27 of the 4000 manual said that the delay switch range was changed from 35/50 to 16/25 ms for better sonic performance. I would note this when looking at different candidates. The 4000t's Digital Time Lens is explained 0n page 13 of the 4000t manual. I would also take the time to look at page 4 of the 4000 manual and page 4 of the 4000t in particular the explanations of buttons 22, 26, 27, 28, and 29. I get the feeling that the 4000t “Digital Time Lens” was designed around what sounds like were the shortcomings of the digital reproduction of Analog material. And the internal amps were taken out to allow room for this new circuitry (Only speculation on my part). With the internal amp(s) taken out this allows for the addition of more Carver amps to help drive this feature. So, which one to choose? Door 1 or Door2? My experience was with the 4000 and I enjoyed every minute of listening in just the two-speaker mode. I can "only assume" that the 4000t will be as good if not better. Your choice but let Nelion @Nahash5150do his magic and restore it to better than new condition. Ask about having the phono amps, time delay, auto correlator and sonic holography circuits tuned and calibrated. Money well spent in my opinion. Hope this helps.