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Twisted Pear Audio - Buffalo32S (ES9018 DAC)

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#841
Russ White said:
So he only did 4X oversampling into the 8X oversampling input? While I am confident this will work fine and even sound good, it is by no means optimal.

In any case the 80Mhz clock should have worked fine in this mode because 352.8khz * 4 = 1.4112mhz and 1.4112mhz * 24 is ~ 34mhz

Now one thing to note. The datasheet is clear that the maximum sample rate in 8FS mode is 192khz * 8 which is 1.536mhz. So the maximum sample rate when using the DAC as designed is 192khz without breaking some rules (I cannot elaborate here).

So I expect your issue has little to do with the master clock speed. And more to do with the specific application you guys happened to be doing on the ESS demo board.

One thing also to consider is that the ES9018 is extremely clock dependent. Any clock quality issues will result in the DAC not holding a lock.
Click to expand...

Dear Russ,

I appreciated your comment very much.
I have to apology to all. I misunderstood that "normal mode" of over sampling filter meant "8 x". They do not say so. In the case of 352.8 kHz / 24 bit PCM with "normal mode", the internal processing might be done in "4 x" or another as Russ pointed out.
Anyway, ES9018 accepts fs of up to 500 kHz in PCM, normal mode and fs of maximum 1.536 MHz in PCM, NOS mode.

I hope Buffalo 32 DAC users can enjoy a quality of 352.8 kHz / 24 bit audio files exploiting an amazing performance of ES9018 chip. I believe we can do that without any modifications.
I think an advanced approach of 2L has a great value and I'd like to applaud their generous release of high resolution audio files at their web site.

Bunpei
 
#844
Dear Russ,

not only 2L is releasing DXD music files. Also FIM (First Impression Music) is releaseing a bunch of DXD files. I think they are in 32bit format and with 352.8kHz sampling freq.

Not that I am unhappy with 32/192 but I surely would like to use
the original recording files (DXD) if they are available
and not only a down sampled version of the original DXD files.

Classical, jazz, and crossover music CDs, XRCDs and SACDs. Sound clips



Regards,


Russ White said:
Bunpei,

I am perfectly happy with 192khz 32bit. 🙂

Cheers!
Russ
Click to expand...
 
#845
DXD Files

Dear Russ,

I think it is a great initiative that DXD files are released to the public. As far as I know, DXD is the original recording files, and not down sampled or manipulated in any way.

FIM (First Impression Music) is also releaseing several DXD albums
Classical, jazz, and crossover music CDs, XRCDs and SACDs. Sound clips

Not that I am unhappy with 32/192 but I surely would like to be able to play non down sampled DXD files.
If the Buffalo II could do that it would be great 🙂


Regards,

Russ White said:
Bunpei,

I am perfectly happy with 192khz 32bit. 🙂

Cheers!
Russ
Click to expand...
 
#846
IngemarR said:
Dear Russ,

I think it is a great initiative that DXD files are released to the public. As far as I know, DXD is the original recording files, and not down sampled or manipulated in any way.

FIM (First Impression Music) is also releaseing several DXD albums
Classical, jazz, and crossover music CDs, XRCDs and SACDs. Sound clips

Not that I am unhappy with 32/192 but I surely would like to be able to play non down sampled DXD files.
If the Buffalo II could do that it would be great 🙂


Regards,
Click to expand...

It is my understanding (I work around studios) that most DXD files are simply converted from DSD. Am I wrong about this? I have not really studied it so I could well be. 🙂

In any case, have every reason to believe it would play them in the same way the demo did. 🙂

I would be happy to test it.

Cheers!
Russ
 
Last edited:
#848
Dear Russ,


if you have the time, I think it is worth investigating how we can play DXD files on the Buffalo II. Maybe I am not the one to want this possibility...

Regarding DXD vs DSD you must be the more knowledgable as you work around studios (which I do not). Or maybe you can ask around?

Thanks and regards,



Russ White said:
It is my understanding (I work around studios) that most DXD files are simply converted from DSD. Am I wrong about this? I have not really studied it so I could well be. 🙂

In any case, have every reason to believe it would play them in the same way the demo did. 🙂

I would be happy to test it.

Cheers!
Russ
Click to expand...
 
#850
IngemarR said:
Dear Russ,


if you have the time, I think it is worth investigating how we can play DXD files on the Buffalo II. Maybe I am not the one to want this possibility...

Regarding DXD vs DSD you must be the more knowledgable as you work around studios (which I do not). Or maybe you can ask around?

Thanks and regards,
Click to expand...

Well my experience is not much with DXD honestly. 🙂

My only exposure to them has been when people converted DSD masters to PCM for purposes of mixing.

That's not to say that is the only way they are used, just that it is all I have seen. 🙂

I will see what I can arrange in the way of a test.

Cheers!
Russ
 
#851
Russ White said:
Hi Greg,

Looks like a fun project!

Either 5V or 6V is OK, 5V will keep the temps down a bit. I don't have any evidence that one "sounds" better than the other.

Cheers!
Russ
Click to expand...

Thanks Russ. I'll drop the voltage on the Placid down a bit then.

And it has been a fun project... taken me MUCH longer to get to this stage than I planned, but it was definitely not the fault of the Buff32 or the Placids.

Really looking forward to seeing what the BuffII will do here.

Later!

Greg in Mississippi
 
#852
Russ White said:
That's not to say that is the only way they are used, just that it is all I have seen. 🙂
Click to expand...

In the 2L HiRes Download - test bench, they say
High Resolution Music DOWNLOAD services

"Prior to entering a commercially available download service for high resolution audio files we invite you to join us in this evaluation of future consumer delivery formats. FLAC is a lossless encoding of WAV-files derived directly from our production original used for the SACD. All resolutions and encodings are derived from the same original DXD source files. ... "

I understand that they record their master in DXD format files and edit, mix down and down-sampling into release masters for SACD, CD, mp3, etc.

When I asked the importance of playing 192 kHz/ 32 bit files, an expert replied to me;
"No need for 192 kHz/ 32 bit replay because no recording on 32 bit. DXD is more important."

Bunpei
 
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