Some impressions as it was a feat of back breaking rearrangements of equipment and connecting cables for the mono D1x dacs.
There has been a big improvement over the Esoteric house sound, it is fuller, denser with exceptional low level detail retrieval, and smoothness of the skin of a young fair maiden.
It retains all the highs, lows of the Esoteric sound in an exceptional balanced and natural way, with this new smoothness to the entire musical portrayal .
It doesn't sound dark, highlighted in certain frequencies nor call it warm (in a tube way) as compared to other dacs.
To me it strikes the perfect balance now and has just the right touch of "Yang" in the midrange not leaning towards calling it lean or warm; a better description is "natural sounding" and banished all last traces of digitalness.
We know the fine balance that once the character of a particular equipment is called warm, this characteristics flow on through the entire upper and lower regions as well.
I cannot make any valid comparisons to any other brands nor the equivalent older sibling, the D1, D02x or even K1 which i did not test upon acquiring the D1x as there was no reason to.
My retired K-01x which over the years with care taken on implementation of footers/isolation, cablings and of course most critically, clocking and the associated clock cables leaves no room for comparison with a unclocked and unoptimised K-01x with none of the mentioned done.
My K-01x offered years of exceptional sonic bliss to me, not nit picking, i could have still have been very happy with it, from highs to lows, i could not fault its sound, maybe, for the more connected midrange that the D1x shows what it was missing.
I can only assume, that this departure from the AKM chips used in every other Esoteric player or dac makes such reference meaningless now again a full discrete design dac.
My option to stick with Esoteric largely was based from the departure from off shelf dac chips and a true MQA dac accepting MQA for all inputs, unlike many brands which many a input card via usb or ethernet made by one MQA certified partner supplying these companies to make their dacs MQA designated. Note, this is not full MQA dac compliant where the dac designed have to be certified and tested by MQA (important note for streaming users).
For all owners of Esoteric upgraders planning on a move up this new model, i will not describe terms or oh just so real, live or analogue sounding , or the best dac i have ever heard .... over the last 30 years blah, blah, blah.
For me, the most analogue sounding , vinyl like combo was my Forsell Air bearing transport and dac, period.
My general encounters and impressions with other excellent sounding top brands of dacs are generally that have a certain characteristic, MSB > has a darker presentation; DCS > over saturated presentation, CH > rather clean and precise.
To me, no MSB, DCS, CH or Esoteric can even compare, but the Forsell could not portray dynamic rock, pop and electronic music well and i have since sold it long ago for this reason alone.
I have not owned any R2R dacs (now in hype), but as a teenager, when CD's were replacing vinyl and i had no exposure to real hi-fi of today, except what my dad was using, The first ES Sony CD player complementing a Revox open real, Marantz solid state gear with Tannoy monitor Golds back then. I recall how i felt something amiss listening to Pet Shop boys, Madonna, Michael Jackson .etc.... on my Midi Vinyl Hifi setup so nicer that the CDs through the Marantz and Monitor Gold (that was actually pretty high end back then in the early 80's.
I was then transferring my cd's on to the Revox open real for fun and 3 head cassette and vastly found the music more satisfying and enjoyable through the Marantz and Tannoy setup. To me cd's had something wrong and missing which i did not no any audiophile vocab back then, but it never crossed my mind that the much hyped superior CD and coming of the digital age a mistake back then.
We were looking out for the marking of "DDD" which meant full digital transfers which were meant to be as superior to ADD (which was an analogue to digital transfer) in the coming of the new digital age. DDD was touted as the superior technology, no forums to debate on, or receive options from others.
www.com did not even exist then. Many excellent recorded vinyls were thrown in the bin - many which woud go for a few hundreds a pop second hand now!). rag and bone collected didnt even want to take them (to help dispose off for you)
The new D1x dac has made a big advancement from the Esoteric and AKM sound, every area has been improved tremendously that any seemingly touch of hardness that existed from a a properly setup and master clocked Esoteric front end has been banished.
Coming from a previous Esoteric player does not leave me finding a totally unfamiliar different character that i find good, but don't feel at home with. (don't call me a fan boy, i ditched Esoteric as a contender for an upgrade) until i found out of the discrete dac implementation,
Some further background from Japanese interviews with Esoteric designers clearly states that they have moved forward with the concept of their "Velvet sound" of their previous latest generation of products and through development with AKM.
There are rumours that development engineers from the non defunct Wadia brand joined Gibson Group, could this be a reason to venture to discrete technology.
Esoteric has retain all that and taken a big, many advanced steps forward in that direction with a new found smoothness and naturalness to the presentation.
It is unfortunate that i will not likely be add the P1x due to my CD selection dwindling over the past few years and most of my CD's waiting to be digitised as the transport has a significant sonic impact to any top rate dac.
I am confident, yet sad that i will not have the Elink connection from the P1x to the D1x to hear the full glory of CD and SACD playback.
Retiring my K-01x and using it through AES to the D1x is not a meaningful test and will not offer my opinion how it will sound played to the D1x.
I know the D1x is now providing me an excellent first class balance over the entire spectrum streaming from my Aurender W20 (every equipment fully clocked via Mutec 10m outputs, previously Cybershaft op17 clock which is comparable with the Mutec) in a relatively simple straight forward system.
I want to highlight that testing any Esoteric setup without master clocking is incomplete and opinions on the sound, discounted by 50%.