Best Quality and Lowest Jitter Philips Transport
Hi mburnstein,
Unfortunately you don't get a low jitter transport with the crystal hung on the microprocessor.
You can improve the sound by installing a low jitter clock.
See also:
http://www.diyaudio.com/forums/showthread.php?s=&threadid=8246&pagenumber=2
Hi mburnstein,
Unfortunately you don't get a low jitter transport with the crystal hung on the microprocessor.
You can improve the sound by installing a low jitter clock.
See also:
http://www.diyaudio.com/forums/showthread.php?s=&threadid=8246&pagenumber=2
Hi,
Some months ago I also looked into the transport as advertised by http://www.daisy-laser.nl/homeoptics/
This is for sure a damn good transport. But concerning jitter: It is controlled by a SAA7324 chip. The clock is generated by a standard c-mos x-tal oscillator circuit. All the audio-clocks are made with the help of a PLL from the x-tal clock. I wonder if this is the way to go for low jitter at the DAC. Because of the PLL circuit I don’t think a good low jitter external clock as Elso did suggest is of much help, regardless if you use the SPDIF signal or the I2S signal.
An external DAC connected to the SPDIF output and with a good jitter suppression is a better way to go IMHO for this nice transport if you want low jitter.
Cheers
Some months ago I also looked into the transport as advertised by http://www.daisy-laser.nl/homeoptics/
This is for sure a damn good transport. But concerning jitter: It is controlled by a SAA7324 chip. The clock is generated by a standard c-mos x-tal oscillator circuit. All the audio-clocks are made with the help of a PLL from the x-tal clock. I wonder if this is the way to go for low jitter at the DAC. Because of the PLL circuit I don’t think a good low jitter external clock as Elso did suggest is of much help, regardless if you use the SPDIF signal or the I2S signal.
An external DAC connected to the SPDIF output and with a good jitter suppression is a better way to go IMHO for this nice transport if you want low jitter.
Cheers
The Chase of Jitter
http://db.audioasylum.com/cgi/m.pl?forum=tweaks&n=22107&highlight=elso+cs8412&r=&session=
Nowdays I know better and we have at our disposal improved interface circuitry, the Wildmonkeysects loopfilter for the CS8412, low noise analog supply for the PLL of the CS8412 and last but not least my Asynchronous Reclocker. Does this mean that the clock in the transport is not important? I say no as I can clearly hear the difference in clockcircuits applied in the transport, even with all these jitter countermeasures implemented!
I admit I am absolutely not familiar with the CDPRO and I hope the situation is not as bad as you describe Pjotr in a regular CDP.
If Philips is using all kinds of PLL to generate the audioclocks much can be improved by using some deviding scheme instead of PLL's.
More than two years ago I made a series of postings on the Audio Asylum postulating it makes no sense to tweak the CS8412 as all cause of jitter is in the transport.Pjotr said:
http://db.audioasylum.com/cgi/m.pl?forum=tweaks&n=22107&highlight=elso+cs8412&r=&session=
Nowdays I know better and we have at our disposal improved interface circuitry, the Wildmonkeysects loopfilter for the CS8412, low noise analog supply for the PLL of the CS8412 and last but not least my Asynchronous Reclocker. Does this mean that the clock in the transport is not important? I say no as I can clearly hear the difference in clockcircuits applied in the transport, even with all these jitter countermeasures implemented!
I admit I am absolutely not familiar with the CDPRO and I hope the situation is not as bad as you describe Pjotr in a regular CDP.
If Philips is using all kinds of PLL to generate the audioclocks much can be improved by using some deviding scheme instead of PLL's.
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