In the months before the DCC Gold CDs were going to be mastered at Location Recording Service back in 1992, Kevin Gray was upgrading the mastering room and searching for a new A/D, D/A system to get more resolution than the old Sony PCM system could give us. Kevin had a nifty vintage EMT stereo echo/reverb plate in the back of the studio and what he did was to record a bunch of "taps" with a drumstick onto the top of the console using his vintage Neumann mic with full reverb up so we could hear the echo trail decay. He recorded them on 15 ips tape and then we cut a lacquer of the numerous reverb hits as well. (Yes, this was as boring as it sounds). We compared the decay time of the lacquer with the "master" analog tape. They matched. Next step of course was to compare the Sony digital PCM-1630 recording of the tape with the lacquer. Surprise (not), they didn't match. The digital master decayed much earlier and the reverb wasn't accurately reproduced to begin with (a common problem back then). It was there, just not ALL there. So, that was our "standard ref" in the goal to upgrading the digital recording system; to find a machine that could record and play back the echo hits in digital so they would match the lacquer in intensity and decay. The unit with the most ambiance retrieval would win. After MUCH searching, Kevin found a Wadia professional unit that was a big improvement on the Sony PCM system. After some proprietary tweaking by Kevin, the Wadia was installed in the system right before I started on the first DCC Gold, "Wheels Of Fire" by Cream. We used that all through the LRS masterings and Kevin took it with him when he switched back to Future Disc Systems in the middle 1990s. Kevin did the same test at AcousTech when he upgraded to what he has now (Pacific). I bring this up not as a digital vs. analog thing but to show that engineers around the world realize the problems that PCM digital has had from the start. We want it to match analog playback and have struggled for 25 years to get it. It's close but not perfect. Can you tell? Dunno. Depends on your playback system and your personal hearing system (yer EARS). You might not care; CDs are so much easier to play. So this is not a new thing, but this is something that we WANT to sound as good as it can. Digital has come a long way but it's not perfect (in the "good" way).