diyAudio

diyAudio (http://www.diyaudio.com/forums/)
-   Digital Source (http://www.diyaudio.com/forums/digital-source/)
-   -   Best quality and lowest jitter Philips transport assembly? (http://www.diyaudio.com/forums/digital-source/9647-best-quality-lowest-jitter-philips-transport-assembly.html)

mburnstein 8th January 2003 09:45 PM

Best quality and lowest jitter Philips transport assembly?
 
CDM9 Pro, CD12.4mkI or II, original CDMI or others?
Thanks
Mark
mburnste@dmc.org

Peter Daniel 11th January 2003 05:44 AM

How about CD-Pro 2?
http://www.daisy-laser.nl/homeoptics/

Elso Kwak 11th January 2003 04:53 PM

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/showt...6&pagenumber=2
;)

tbla 11th January 2003 05:10 PM

peter
 
hi,

btw, hows it goin' with your cdpro 2 player ???

best regards,
troels

Peter Daniel 11th January 2003 06:09 PM

Transport is done and I'm using it with outboard DAC (PCM 1704). I've been busy recently with gainclones and Aleph X so no NOS DAC done yet.

I bought some 2.5" and 2" thick acrylic panels, so my next player will be base on that material.

zelter 13th January 2003 10:31 AM

Hi Peter,

I'm just playing with a CD-Pro too. Some questions:

How did You connect the PCM 1704? Did You use I2S?

Did You use a DF 1704 too?

Greetings from Germany

Zelter

Peter Daniel 13th January 2003 01:10 PM

I used both of these chips, with parallel DACs per channel. I'm using SPDIF, because it is stand alone DAC, but eventually I will end up with integrated DAC using I2S.

Pjotr 13th January 2003 05:11 PM

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 donít 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

Elso Kwak 13th January 2003 09:20 PM

The Chase of Jitter
 
Quote:

Originally posted by Pjotr
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 donít 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

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.
http://db.audioasylum.com/cgi/m.pl?f...12&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.:angel:


All times are GMT. The time now is 06:15 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio


Content Relevant URLs by vBSEO 3.3.2