Mind sharing some of what you guys are smoking? Oh yes - Many thanks for attaching those movie clips, now I cannot open those pages from China… So sorry if I’ve missed some questions…
Ill try to answer all questions, again sorry if I’ve missed some:-
Asking me for my opinion on Naim Amps, would be askin to sending me walking down the streets of Baghdad wearing an American Baseball Cap and an "I love America Tee shirt!!!" Guys I have kids, a Family!
Short Story, Chapter 1 – A young designer’s first introduction to the “World of Hi Fi”
Many MANY years ago there was a 19 year old kid who thought he had developed a class leading DAC. Week after week the DAC’s performance was hone and tweaked until it’s young developer was 100% certain it was the very best he could design. Eager to show the world his creation, the young DAC designer would take his DAC to the local HiFi shop in sunny, peaceful Crystal Place to compare against the “Established” competition. These trips only served to convince the young designer that he was indeed on the correct path… The verdict was always unanimous amongst those who had a chance to listen, yes indeed, the young designers DAC outclassed the competition.
Then one rainy day, 2 boxes arrived at the HiFi dealer from a company call Naim – Naim’s very first CD player the CD1. The young design had never seen so much raw excitement from a grown man, the local HiFi shop owner almost ripping the cartons apart – before the shop's front door had closed behind the back of the delivery driver, the Naim CD was plugged in and warming up…
The young designer sat down with the shops owner and started to listen to the Naim CD1 - with his own DAC at hand for comparison… The listening session served yet again to the young designer, that his design was really heads above the competition… Sound stage, left to right, and with Depth, Clarity around each instrument, Clear Bass lines, no hint of a mumbling Bass "drone", clear Treble, no need to dive for cover in pure fear for ones hearing…. While the Naim was muffled and constrained by comparison, while struggling to define sound stage and instruments – Bass line sounding the same no matter what was being played…
The young designer turned around with a big smile across his face – then the Shop owner said speaking of the Naim “You see, clearly superior” – the young designer then realised that he would never win…
Sadly, the young designer in pure despair was banished to serve the rest of his life in the depths of Asia… (Without food that was destined to stay in him longer then half an hour at a time).
I think you can all agree, that the morel of this very sad tale is that some people are too afraid to believe in their own judgments, and hear what they are told to hear…
And finally back to the plot, some more answers...
No the PSU is linear – 36 regulated PSU rails in the CD with 38 regulated PSU rails in CDQ.
The CD,CDQ, DQ & MDAC all use the ESS9018, originally in was planned to use the ESS9008 for the CD, but this IC has so many internal design issues, that simply we could not use it. Late in the day we where forced into using the ESS9018 across the range. Dominik and myself worked with ESS to helped identify and resolve issues with ESS’s first generation DAC’S (9006 & 9008) – resulting in the much improved (and now usable) 9016, 9018. Still the ESS DAC range is very hard to work with, with many “work arounds” required to gain stable performance… ESS support is VERY weak – thankfully we could work directly with Dustin Foreman the IC’s designer.
In my humblest opinion, the ESS DAC’s are really the very best “Off the Shelf” DAC chips you can buy – so it has been worth the extended effort in the long run… but what a bloody headache its been….
The ESS DAC is used in Balanced Voltage mode, so the analog stage is truly active balanced (using discrete Class A FET input based class A stages – transformers are not used). During the development cycle I originally used bipolar (transistor) based input stages, these resulted in a 134dB Dynamic range (Awtd), but sounded below par (crap) – well in fact it sounded like Audiolab of old, clinical, hard, cold, uninvolving… so I quickly changed to FET inputs pairs (and other tweaks) , reducing the dynamic range to 117dB due to the FET’s more nosey performance – but thankfully the audio quality approached my target… Analogue!
Using the ESS we are able to design our own filter coefficients – no need for external DSP, the ESS has all the internal DSP processing required – just requires a competent software guy and the use of MATLAB…
The DQ / CDQ analogue input stage comprises of Gold Relay switch input selection, then converted to a Balanced signal path (all ClassA biased stages are used though out the signal path) – to a Balanced integrated passive switched attenuator for each channel (for Volume control) – then to discrete balanced FET input Hi-Current class A output buffer.
When using the DAC section of the DQ / CDQ the Gain control can be performed in the Digital domain (User selectable Analogue or Digital Pre-Amplifier), so the internal “Pre Amplifier stage” can be bypassed (Via High quality Gold Relays) for the shortest signal path. No matter how good or bad a Pre-Amplifier is, at can never be totally 100% transparent – so better to do without if possible. To this end, internally the DAC output stage incorporates a FET input based discrete High Current Class A output stage)… The simpler the signal path the better… Bring back the “Needle and Horn” I say…
When using the CDQ in “Digital Pre-Amplifier Mode”, the unit’s basically an 8200CD but with digital volume control. Dominik and I wanted to add the “Volume control” function to the 8200CD – but guess what the marketing Dept. “STRONGLY” refused… would have only cost 2 extra buttons on front panel – less then US$0.5… wonder why…
Talking about the history of the digital input support of the 8200CD, well originally there was very firm rejection of adding USB and digital inputs on a “New” CD player from marketing Dept, and CDQ / DQ was not too exist (in fact CDQ was actually panned – DQ was not even on the table) - with the famous quote that I will never forget “We are not a DAC company”… I pushed my own agenda, designed the products behind the scene, and thanks to the publics postings and reception to the products, the Marketing Dept. has “come around” to releasing the CDQ and now DQ….
But remember we are not a DAC company – well thankfully CD has such a bright future… Please let me find a very hard brick wall so I can bash my own head against it… ouch… ouch… ouch… Oh it really hurts… ouch... hey that's starting to feel good.... Yes - I think I'm going to work in China...
When we started development of this DAC (recall it was originally designed for our own brand), USB2.0 audio (for 24/192) was not yet conceived – and even to this day (in the mainstream OS systems) only Apple supports 192/24 over USB native - without the need for external software Drivers. As a small Audio based company we could not attain to support software drivers for Windows PC’s and all the instabilities associated with the computers, so we decided only to support 24/96KHz over USB – so alas, USB 24/96KHz is a legacy from the roots of the design.
Even today, there is still not a stable source for USB 24/192 over USB – until Microsoft build in native driverless support of HiRes USB into Windows, we do not have the resources to support customers PC installation issues – how many times has the installation process of your new product gone smoothly under Windows???
Thankfully, USB 24/96 is supported driverless on all major operating systems.
Also, the Digital Optical inputs are only "RATED" to support upto 24/96KHz - although they "May" work with higher input rates, depending on the quality of the Transmitting source...