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Old 7th February 2013, 09:02 AM   #2111
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Quote:
Originally Posted by PHEONIX View Post
On the crystal front all things being equal , the lowest phase noise offset at say 10Hz (important metric for jitter performance) is always lower on crystal oscillators which are lower in frequency, phase noise increases with increasing oscillator frequency. Maybe this explains what your hearing .
However, manufacturer of crystal declares phase noise performance limit for frequency higher than used here of 100MHz
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Old 7th February 2013, 09:08 AM   #2112
qusp is offline qusp  Australia
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that depends on the XO, any decent manufacturer for XO used for audio lists close in phase noise as well.
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Old 7th February 2013, 09:24 AM   #2113
Bunpei is offline Bunpei  Japan
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Originally Posted by KlipschKid View Post
... I prefer asynch with 50Mhz saw to synch with 45.1584Mhz Fox Xpresso, so that's what I'm gonna stick with ...
In my definition of "synchronous master clocking", a transport shares the identical master clock oscillator with ES9018 DAC and it generates synchronous I2S/DSD signals based on the master clock.
Is your Fox Xpresso 45.1584 MHz used as a master clock for your transport?
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Old 7th February 2013, 10:23 AM   #2114
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Originally Posted by Bunpei View Post
In my definition of "synchronous master clocking", a transport shares the identical master clock oscillator with ES9018 DAC and it generates synchronous I2S/DSD signals based on the master clock.
Is your Fox Xpresso 45.1584 MHz used as a master clock for your transport?
Yes, it is a CM6631A usb transport. 24bit 192kHz USB to I2S PCB CM6631/A w/Ultralow noise 6.5uV regulator for ES9018 | eBay

Fox Xpresso is okay, not great, so I think that is why synch is not as good as asynch SAW. And it could be my soldering the u.fl cable too.
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Old 7th February 2013, 10:28 AM   #2115
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Bunpei, what is the simplest solution to get a DSD source signal and where to find DSD files?
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Last edited by AndriyOL; 7th February 2013 at 10:30 AM.
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Old 7th February 2013, 10:47 AM   #2116
Bunpei is offline Bunpei  Japan
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Hi, KlipschKid,

I appreciated your clarification!

FOX Xpresso is a good commodity level product.
However, I think it's not of a grade commensurate with the quality of ES9018.
I'd like to recommend such replacements with Crystek or NDK oscillator and applying such a low noise voltage regulator as TPS7A4700 or ADP151, dedicated only to the oscillator device.
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Old 7th February 2013, 11:04 AM   #2117
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Hi Bunpei,

My DAC uses adp151 ( for 3.3V and 1.2V and an AMB sigma11 psu @ 3,8V for AVCC ) and I have tried 22.5792Mhz CCHD-957 in asynch too. It only worked for 44.1khz and 48Khz, but still the saw is slightly better, or perhaps I should say, I prefer the SAW.

The CM6631A uses one LP5900 6.5uV noise for the xo's and another LP5900 for the CM6631A IC. It's not powered from the USB. It has its own low noise 5V supply as pre-regulators for the LP5900.

So I'm quite sure SAW is a good xo for ES9018.

I could remove the 45Mhz from the cm6631 and put in an NDK, but my skills are poor and I think I might damage the cm6631 pcb.

cheers

Last edited by KlipschKid; 7th February 2013 at 11:11 AM.
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Old 7th February 2013, 12:29 PM   #2118
Bunpei is offline Bunpei  Japan
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Quote:
Originally Posted by AndriyOL View Post
Bunpei, what is the simplest solution to get a DSD source signal and where to find DSD files?
For getting a DSD source signal;
Plan A: Amanero Combo384 Module
Plan B: Hacking a SACD or Blu-ray player of Sony or Oppo of reasonable prices and tapping DSD signals

Where to find DSD files;
Plan A(above): Downloading from a web sites of 2L, Blue Cost Records, e-Onkyo etc. Converting from PCM sources by using Korg AudioGate software
Plan B(above): In your SACDs
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Old 7th February 2013, 12:38 PM   #2119
Bunpei is offline Bunpei  Japan
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Quote:
Originally Posted by KlipschKid View Post
... So I'm quite sure SAW is a good xo for ES9018. ...
I have understood that you are satisfied with the oscillator "in your environment".
Please remember that other audiophiles might be enjoying better sounds in the different environment under non-default register setting even if they use the same DAC device, ES9018.
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Old 7th February 2013, 12:47 PM   #2120
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Quote:
Originally Posted by RayCtech View Post
And also the clock speeds can be changed if you add clocks and control for that...

I run with clocks at 22/24M, 45/49M and 90/98M...
The fun of it is that the register settings that gives the best fidelity are identical for all clock speeds.
And even greater fun is it that it is the lowest clock speeds gives the best fidelity.

I have for sure tested clocks above 100MHz - and they was the identical 1ps jitter clocks that I have in the lower speeds.
I gave the overspeed clocks some days to settle before they was removed.
I cannot understand why the increased noise and reduced fidelity are preferred by some individuals, but it is for sure different...
This makes the most sense to me. Synchronous operation, lowest speed
clock possible. What clocks are you using?

Have you tried OS filter disabled?
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