|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
156.153.254.41
In Reply to: Please give more details - I'm about to buy a NS999ES posted by jeromelang on December 2, 2004 at 16:38:20:
The explanation as to why Allen likes the potential of the SCD-1/777ES and DVP-S9000ES (and the carousel SCD-C333ES in the USA) is easily obtained from the Vacuum State website and he has posted his reasons on a number of occasions on this forum. As a long time member, I'm sure you have seen this data before.
Regards,
Geoff
Follow Ups:
Here's my understanding of why Allen thinks the 9000ES is a better mod platform than the 999ES:The earlier generation Sony SACD machines use a non-conventional, DSD only "current pulse" DAC. CD playback is provided by converting PCM to DSD in a digital filter. Allen's mod to these machines taps the output of the digital filter (VC24 chip) and passes it through a circuit of his design that does low pass filtering and buffering for output. It bypasses the DAC and all the output circuitry, including a ton of op-amps.
The later generation Sony machines use conventional multi-format Burr Brown DACs just like Denon, Pioneer, et. al. So his current mod will not work in these machines. The BB DACs handle PCM and DSD inputs, so there is no conversion from PCM to DSD prior to the DAC. That means the DACs can't be bypassed without losing PCM playback capability, so all existing mods to these machines preserve the BB DACs and therefore don't offer as pure a signal path.
...not only can one bypass almost all of the extranious stuff in an original SONY VC24 based player - they also have very direct clock signal paths - using a clock of the correct frequency and feeding it directly to where it's needed. This makes adding a superior clock easy to do, and very effective.The 9000ES even has two different clocks - one for SACD & RBCD, and a completely different one for DVD playback.
However most of the more recent SACD/RBCD capable DVD players have just one clock, and massage this clock signal with all sorts of phase locked loops etc to generate the several different frequencies needed - a great move to keep costs down, but in the process adding all sorts of jitter and other clock related errors. So adding even the best after market clock does little good as it's purity of signal will be 'massaged' as well...
So I say to Jerome, buy the dirt cheap 9000ES, or let me know who's selling it and I'll buy it myself!
Allen
nt
My first reply was to Sordidman, and then I replied to you.
nt
Eric"Julian Dicks is everywhere.
It's like they've got eleven Dicks on the
field."
I don't think we ever seen specific reasons why the S9000ES is preferred to the NS999ES as a stock player and with greater potential for sonic improvement after modifications.If it is due to transport, I am sure most people would also like to know why does he consider the one in the S9000ES to be better, since it seems to have more TOC read problem than the NS999ES. If it is DAC chip and implementation in question, I think people would like to know which chip is used in each model. I don't think that information is available here. If there's any manufacturer data that Allen can cite to let us know if the DAC implementation on each player are optimizing its performance as well as the format, then it would be most helpful.
We all are confident that Allen's modification to the analog stages is guaranteed to elicit the best out of DSD format, but what we also like to know specifically why he thinks the NS999ES construction and design is more of a hindrance to him, while the S9000ES has greater potential for improvement.
If you can source all this data within this board, please let us know, it would be most appreciated. Thanks in advance.
...headed "Dave has it correct" explain it enough?The bitstream VC24 chip is one main reason, the other is the vastly superior clock signal path.
Both allow the upgrader to really do some good work - machines with (IMO) compromised circuitry may sound quite good stock - but just don't offer the reasonably easy and cost effective possibilities to make great sonic changes.
Is that I never have problems reading discs now that I have an NS999ES. I don't know whether the transport is better, but it certainly seems to work well on TOC (fast too). It is such a welcome change from my first gen player. While this player is lighter in weight than the 9000ES and the other first gen sacd-only players, I would buy it over those machines for the reliability (sounds damn good too, with the Modwright platinum mods).
I'm in the EXACT same boat as you on this and want to do exactly what you're doing...Cheers,
This post is made possible by the generous support of people like you and our sponsors: