Emile, no tech head me, but I wasn't expecting such a detailed summary of old previous cutting edge cd transports and dacs to be judged less favourably versus Extreme on the basis of connecting cables. There are/were plenty of great one-box models where this cable is not a consideration.It definitely is. Several of my friends still own some of previous century crazy expensive stacks, back then these would cost more then a decent sized house here in The Netherlands. Not so nowadays which may put some perspective on how expensive high end gear really is these days relative to real estate pricing. I remember when I got the Wadia 2000 stack, that is like 25-30 years ago. I had to delay buying a house for that. I greatly preferred it over the ML30/31 for midrange magic although the ML stack had killer bass extension. Switching transports/DACs was not successful though, with the Wadia you had to use a digimaster (I replaced that with a Genesis Digital Lens which did a bit better) to convert AES to ST fiber to be able to use the ML31 with it, so that was an obvious drawback. Combining the 2 was pretty poor though. I did prefer the Levinson 31 over the DCS transport (forgot the model name), even when using the Verona clock, with the DCS Elgar/Purcell which came out probably 10 years after (for bass again). I have a friend who is still using the large Metronome stack, I don't remember the model designations, it was their top offering around 10 years ago. Another one is still using the Wadia 7/9 which is a very successful pairing as well, still going strong bar resolution/clarity. Over the years we have swapped a lot of big stack transports / dacs but usually the same brand pairings worked best.
A big difference with server technology is the interface. These transport/dac stacks all use/used AES or a proprietary variation on that to transport I2S between them. It may come as no surprise that the AES or SPDIF output we can optionally fit into the Extreme sounds closer to a CD transport then USB or Ethernet. Generally speaking it can give you a somewhat softer / more laidback presentation. But USB or Ethernet are the interfaces of the future. On the DAC end these are not always very well executed, as strange as it may sound it's a different technology then Digital to Analogue conversion so it's often just fitted because manufacturers have to, but not always well implemented. Things are improving there though, one of the clearest examples of advancing technology being the MSB Pro USB module. XMOS has come a long way with 8,16,32 core USB receivers, split into 2 processing domains for the USB side and I2S side, Thesycon has developed a very advanced interface which is in the latest T+A 3000 series for example. https://www.thesycon.de/eng/u-hear.shtml .
Are you really saying use of USB and Ethernet cables is THE critical consideration for why you view these old behemoths as by definition inferior?
I still find it telling that there is no news on the horizon for what me and at least a few others would find truly fascinating...a proper A/B of Extreme versus top top modern cd transport eg MSB Select, Wadax Atlantis, Esoteric, Neodio Origine, JMF 3.7.
If I have ANY reservations of a really well optimised SGM setup I'm very familiar with, it is lack of last degree of natural bloom and mids density. I can only go on aural memory, but the Audio Aero cdp the SGM replaced I would say had a certain degree of extra gravitas in mids, as does my Eera cdp, and of course vinyl.