Very expensive audio is mainly for people with too much money and not to listen to. It is quite often a showoff of wealth. Such equipment usually wears from not using 
The chip still is the few Euro costing chip as used in cheap devices and we don’t know the reasons why it was chosen but price and support of the producer usually are important factors. Most will remember classic Hifi brands buying Philips CD mechs and PCBs only to build them into their beautiful casings with shiny logos. Customers buy with emotions.
Of course there are companies that make tremendous audio but they are rarely in the very expensive region.
When I heard a sub 100 Euro costing DAC outperform a Krell DAC I was healed with believing in brand loyalty/reputation.
The chip still is the few Euro costing chip as used in cheap devices and we don’t know the reasons why it was chosen but price and support of the producer usually are important factors. Most will remember classic Hifi brands buying Philips CD mechs and PCBs only to build them into their beautiful casings with shiny logos. Customers buy with emotions.Of course there are companies that make tremendous audio but they are rarely in the very expensive region.
When I heard a sub 100 Euro costing DAC outperform a Krell DAC I was healed with believing in brand loyalty/reputation.
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Why are so many preoccupied with others do with their money? The level of vitriol directed by some at buyers of expensive hifi borders on the irrational. If something is not to your liking, it doesn't really matter what it costs. Don't see the need to vilify those making different purchasing decisions.
Hello.
The Sony CDP-X707ES and other similar high end CD-players, such as the previous CDP-X779Es or the following CDP-XA7ES used not CXD2565 DAC chip, but CXD2562, which is vastly different from the CXD2565 and is more of an evolution of the CXD2552 (no digital interpolation filter on-chip but only a multilevel delta-sigma modulator followed by a PLM DAC stage and buffer output stage). I think no datasheet of the CXD2562 was ever publicly released, but I can be wrong.
The Sony PLM converter system was described in the October 1990 issue of Electronic Today International by Eric Kingdom, page 45 : https://www.worldradiohistory.com/UK/Electronics-Today-UK/90s/Electronics-Today-1990-10.pdf
I think the Sony patent relative to the DAC of this system is this one : https://patentimages.storage.googleapis.com/eb/4d/0d/7159f31ed7618b/US5021788.pdf
I also think this patent is related to the fabrication of the die of the large scale integrated circuit in which the actual DAC was housed : https://patentimages.storage.googleapis.com/de/34/8a/dbbbb02b609926/US5023615.pdf
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Similar methods are being used to today to make even better dacs. One example of Sigma-Delta PWM: https://www.teledynedalsa.com/en/pr...gn/design-products/pwm-sigma-delta-modulator/
There are various ways to do it. IIRC Bruno Putzeys used that general technique for his Mola Mola dac.
There are various ways to do it. IIRC Bruno Putzeys used that general technique for his Mola Mola dac.