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Old 29th March 2004, 11:54 AM   #21
JohnW is offline JohnW  Hong Kong
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The simple fact is that the PCM1732 DAC (at least in SRC upsample mode) is operated from the 24MHz clock irrespective of the jitter attenuation abilities of the SRC.

No matter how good the transport section clock is, IT CAN NEVER BE BETTER then the DAC’s 24MHz Master Clock, as the DAC’s Master clock is the critical “Heart Beat” of the Digital to Audio conversation. The Jitter performance (Phase Noise) on the DAC’s master clock will take precedence over any proceeding "perfect" clock – this is an undisputable fact.

Therefore, with this essential fact in mind, the DAC’s master clock (24MHz) must be improved to a point where it is not the limiting factor. We could discuss until the cows come home the virtues of SRC jitter attenuation and re-latching the I2S data, but the significance of the quality of the Master Clock performance operating the DAC Audio conversion is an undeniable reality.
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Old 29th March 2004, 07:33 PM   #22
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John, in my experience, the 24Mhz clock didn't improve the sound quality too much in this CD player...
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Old 18th August 2004, 01:36 PM   #23
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Hi,
thanks for your interesting message. I'm lookink for a low phase noise oscillator for my DAC, at 24.576 MHz. Can you help me? I can't find it! Regards,
Francesco
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Old 19th August 2004, 09:30 AM   #24
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Quote:
Originally posted by JohnW
The simple fact is that the PCM1732 DAC (at least in SRC upsample mode) is operated from the 24MHz clock irrespective of the jitter attenuation abilities of the SRC.

No matter how good the transport section clock is, IT CAN NEVER BE BETTER then the DAC’s 24MHz Master Clock, as the DAC’s Master clock is the critical “Heart Beat” of the Digital to Audio conversation. The Jitter performance (Phase Noise) on the DAC’s master clock will take precedence over any proceeding "perfect" clock – this is an undisputable fact.

Therefore, with this essential fact in mind, the DAC’s master clock (24MHz) must be improved to a point where it is not the limiting factor. We could discuss until the cows come home the virtues of SRC jitter attenuation and re-latching the I2S data, but the significance of the quality of the Master Clock performance operating the DAC Audio conversion is an undeniable reality.
Hi

You cannot generalise such a statement

Much depends on the properties of the DAC chip itself, how it deals with incoming jitter. On chip crosstalk very much affects conversion proces

Once you know that, you know how sensitivity is of drive ves DAC clock quality

cheers
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Old 19th August 2004, 10:01 AM   #25
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Quote:
Much depends on the properties of the DAC chip itself, how it deals with incoming jitter. On chip crosstalk very much affects conversion proces

Once you know that, you know how sensitivity is of drive ves DAC clock quality
And what do we know in this respect about -any- DAC chip?
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Old 19th August 2004, 02:16 PM   #26
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Gentlemen,

just for your information. I replaced both clocks. It made a big difference and my friend was very satisfied with the sound. Before the change of clocks it wasn´t possible to hear any difference between standard and 24/96 mode, after the mods the difference was obvious.
Sound in generall improved in the usual way and the player was now "listenable" also for longer hearing sessions
I didn´t change any other part (power supply, opamps).


william
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Old 26th August 2004, 03:03 PM   #27
TKK1010 is offline TKK1010  Hong Kong
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Hi FtP838

Please tell us where do you get your TCXO to modify your 15a cd player? You said you got it at terribly low price.

Thanks
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Old 29th August 2004, 08:41 PM   #28
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Any hints on where I can find a suitable clock-board for this CDP, preferably one that isn´t too hard to install?

found LC audio clocks , but £400 for two clocks is a bit steep

are there any other "must have" upgrades that I should consider before gutting my CDP?.

Regards
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Old 30th August 2004, 08:45 AM   #29
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Everwake,

you could try the Kwak or Tent clocks. Prices are much lower than LC-Audio and quality is at least as good. You can even build the Kwak Clock yourself.

William
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Old 17th December 2004, 06:09 PM   #30
arnaudb is offline arnaudb  France
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Hi
I have a problem to solve.
I would like to put a kwak clock on my SAA7327 jolida JD100 controller.

The problem is that there are a clock-in and a clock-out pin on the SAA7327. I have only one output on my kwak clock.
I've looked at the SAA7327 data-sheet and it seems that this ic only work with crystals.

Is someone would have any clue ?
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