Ah ESS, AKM with a tube.
That is quite something different from CS8412 + DF1704 with 2 x PCM63 fed by Motorola 78/79xx and a 4P1L DHT output stage with silver transformers and Rod Coleman regulators.
That is quite something different from CS8412 + DF1704 with 2 x PCM63 fed by Motorola 78/79xx and a 4P1L DHT output stage with silver transformers and Rod Coleman regulators.
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? It does have 2 dacs... I think they switch the signal to negative for one one them called BTC , and it is a negative dac which reverse the output,
Its basically a bit inverter and both signals are placed together at output, which guarantee when the digital says to augment the signal volume there is a guarantee augmentation of current, this is not true for when the signal says go down, because that topology is only additive, it cannot subtract noise, it guarantee that noise will follow proportion of the signal, in one dac the noise increase monotonous to the signal decreasing intensity.
When doing this process of BTC one bit is switched to remove the difficult zero crossing poin in the code and down the ladder switches which are increasingly complicated at this point., and the dac lose one bit doing this, both converter are 19bit but the sum is the equivalent of 20 bit... I think..
Pcm63 also I think switches
There are more advanced papers on the dac , the datasheet is a simplification of what they really did.
I had a discusion with man who worked in Soviet Union transistors manufacturing facility. He is engineer but perfectly understand me why "SAME" parts with same schematics sounds and performs diferently. In western there was better consitency but.. even same factory same month "nearly" same materials and dias process and.. diferent batch can sound diferently! for example SUBJECTIVE sonic diferencies in rs422 line driver made by same factory withing 3 years is noticeable. and I mean same factory. sometimes even marking are identical.
I have learn those lessons with silly xepierence when i hoped that same manufacturers always provide same sound performance regardless of manufacturing data and even regardless of assembly facilities. Audio is very funny thing.. JRC 7815 and Motorolla 7815 sound very diferent. oposite of spectrums actualy. And I am sure you would hear diferencies. whether you prefer LT1963 ar some specifific 78xx is already matter of taste and matching sound to circuit needs. there is good sounding LDO but olde type regulators is sometimes better sonicaly.
I believe you. There are certainly deviations in production over the years. I have noticed that the older AD1865s from the beginning of production sound better than the newer ones near the end of production. Those old ones can be found on ebay but used, unsoldered from old devices. They are still working, but for how long we don't know.
Yes, it is the same with ad1862, pcm1704. Each tech is differently named for the same thing 🙂
Jean paul- good one 🙂 but even there I actualy prefer european cars made until 2008 and US cars around 2012-2016. Those features older non direct injection engines with proper engineering for durability rather than eficienty. I cant speak about new woman because i have only one new. can not comapre with another new ones but she was not very good. probably not properly burned-in .
if we get back to topic- is there anyone still thinking that PCM63 is neutral (by subjective tone)? my expierence with pcm63 (since 2004 june- which is 21 year by now) tell that its not. i know many DAC chips ae not neutral but pcm63 is special in this regard. like PMD100 digital filter- its far from neutral. but feed it with two regulators, try difrent dithering modes , use selected electrolytic for it and its flaws decrease why its good sonic preserve. its like cooking. on the other hand pcm1704, or DF1704 always quaranty nice result without sounding "off"
Have you tried PCM63 without digital filter and oversampling? What would some call the improper application.
The regulators 7xxx are worse than 3xx and discrete compound such and al lt34xx , then there are private companies who make regulators which are suitable for working over 100khz , I would use the datasheet decoupling capacitors values, blackgates or film.
Passive i/v and nos is imo, after measurement and many auditions a filtered inadequate sound, maybe it can measure right it will fall appart if listening to recording of sounds found in nature
Passive i/v and nos is imo, after measurement and many auditions a filtered inadequate sound, maybe it can measure right it will fall appart if listening to recording of sounds found in nature
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no, but i have tried pcm1702 in NOS OS mode where dac designed in way you can disable OS(digital filter sm5813). NOS is much more brutual and more imedate midrange which jumps at you. but absolutely flat sound wth no soudstage depth and high frequencies is very unclear. if music is one vocal in the center maybe NOS could grab somebody atention. but on most music especialy clasical everything colapses. nothing high end at all. and the better speakers the worse sound of NOS dac. and all this with RCRCRC analog filter.(which by itself shifts phase and spoil sound-find simple RC is good compromise between atenuation and phase shift angle) i could not imagine what would be with simple RC or without filters liek some guys listen. so as for myself i am against NOS.
I have the datasheet.
I have the actual chips.
I can build and confirm that it does what BB says it does.
So what is the point of posting such gibberish when the correct information is so readily available?
What you are describing I have never heard. And I made about 10 DACs without oversampling and output filters. I made two DACs with transformers at the output 1:1 due to DC voltage removal and BAL/SE and SE/BAL conversion which is an analog filter at some 80kHz, and on the others I have a preamplifier, amplifier and speakers as a filter. I've never heard such an extreme sound with attacking mids, cloudy highs, no depth and 3D images, just the opposite of that. RCRCRC analog filter is a nasty thing, as you noticed. I would never put that on any device, nor any digital filter.
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