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Xonar Essence ST Sneak Peek
Jun 27, 2009 at 12:05 AM Post #211 of 1,781
Quote:

Originally Posted by Telstar /img/forum/go_quote.gif
Not so good...
The less sigma-delta oversampling the better.
Try to do A/B comparisons.


oh ok! well many external DAC are called "NOS", but when you read the DAC datasheet, it's usually 32 or 64X oversampling.

upsampling is no good, it only increases THD+N(easy to measure w/ SineGen+WaveSpectra).

but even the manufacturer of the DAC that is used on the ST sort of recommends to use 128X for 44.1 and 64X for 96KHz....default is 64X for all rates.

and whatever the several audio engineers I've talked to, or this url I posted above seems to be saying that the more you oversample the better the filtering and the less aliasing you get in the end?

ideally if Asus could let us choose it in the drivers, that'd be awesomeness. I'll discuss it w/ my contact there
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Jun 27, 2009 at 10:52 AM Post #212 of 1,781
If they are really NOS there is no oversampling, nor upsampling.

AFAIK oversampling is required by delta-sigma converters, otherwise they CANT work.
Now, I'm NOT a fan of such converters, so I never got deeper into the subject.
I think that you are right on the more oversampling the better in this case. So, yes, you and your contact at Asus are right
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What it matters the most is thatthe burr brown pcm1792 (=1794 hw version) is one of the best delta-sigma chips made and the main reason why I plan to get the Essence ST, at least for my office pc (where i listen to music through my Senns 80% of the time).

The only thing that the Essence really needs is automatically adjusted sample rate.
 
Jun 27, 2009 at 11:56 AM Post #213 of 1,781
Quote:

Originally Posted by Telstar /img/forum/go_quote.gif
oversampling is required by delta-sigma converters, otherwise they CANT work.
[..]
The only thing that the Essence really needs is automatically adjusted sample rate.


1) indeed, "NOS" is major bs
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manufacturers seem to mix upsampling and oversampling(or maybe they just try to confuse customers), the former must be avoided at any cost so you don't increase harmonic distortion(it doesn't improve sound whatsoever anyway, except if your DAC offers poor filtering at certain rates), but the latter is mandatory....indeed a DAC cannot work w/o oversampling, d'oh!
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2) well, even the Xonar Product Manager is waiting for them....so soon or later they'll show up, I hope
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Jun 27, 2009 at 4:21 PM Post #215 of 1,781
Here is something to you guys to check out:

ST.jpg


That is a shot of the Xonar ST 7.1 Deluxe with the H6 DAC expansion board.
Same card I used in the Sneak Peak... To note about time for a new Sneak Peak...
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Jun 27, 2009 at 6:38 PM Post #216 of 1,781
Quote:

Originally Posted by ROBSCIX /img/forum/go_quote.gif
@fine art acoustic, did you get your new OPA's yet?


No i'am so sorry. They write me a mail that they send it out on Monday next week.
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So with luck i will recieved the discrete OPA's on Friday next week.
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Jun 27, 2009 at 6:48 PM Post #217 of 1,781
In the moment i enjoy my new ST whenever i can. I hope tommorow i get my Boat driver license. After this i will still have more time to improve the ST
 
Jun 28, 2009 at 3:51 PM Post #218 of 1,781
Quote:

Originally Posted by fine art acoustic /img/forum/go_quote.gif
In the moment i enjoy my new ST whenever i can. I hope tommorow i get my Boat driver license. After this i will still have more time to improve the ST


Let us know how it goes.
 
Jun 28, 2009 at 8:25 PM Post #219 of 1,781
Quote:

Originally Posted by ROBSCIX /img/forum/go_quote.gif
Let us know how it goes.


Right now i have my both Boat driver license for the ocean and for the river.
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next week i will have more time for my ST to improof
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Jun 29, 2009 at 11:50 AM Post #220 of 1,781
Quote:

Originally Posted by leeperry /img/forum/go_quote.gif
1) indeed, "NOS" is major bs
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No, its not, but it wont work in a sigma-delta converter. It requires a multibit chip and LOTS of care in the design of all circuits.
Something that you will never see in the pc audio market.

The Essence ST is IMO as good as we'll ever gonna get inside a computer.
 
Jun 29, 2009 at 11:57 AM Post #221 of 1,781
Quote:

Originally Posted by Telstar /img/forum/go_quote.gif
No, its not, but it wont work in a sigma-delta converter.


ok, which ones then? each time I've found "NOS" DAC's being advertized, I checked the datasheet of the DAC IC and it was using mandatory 32 or 64X OS
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Jun 29, 2009 at 4:12 PM Post #222 of 1,781
Quote:

Originally Posted by fine art acoustic /img/forum/go_quote.gif
Right now i have my both Boat driver license for the ocean and for the river.
beerchug.gif

next week i will have more time for my ST to improof
o2smile.gif



Do you have any other ideas besides the discrete opamps?
 
Jun 29, 2009 at 5:31 PM Post #223 of 1,781
Quote:

Originally Posted by ROBSCIX /img/forum/go_quote.gif
Do you have any other ideas besides the discrete opamps?


Not yet. Perhaps the lt1364 in the Buffer but first i want to gamble with the discrete.
By the way yesterday i was realy shocked with a plugin in Foobar where you can deside the upsamplingrate from 44100 to 96000. I use 96000 but i wanted to know how sound the 44100 and the result was a total other interpretation but i had not the time to make any decision if i'am happy with this or not but this was a very very big difference.
Just trie it. I'am interested what you think about.
 
Jun 30, 2009 at 3:48 PM Post #224 of 1,781
Today i rexieved the new ST good situation to change Chip OP 2 x LME49720NA=i/v, 1 x LT1364=Buffer (befor LM4562) the LT has for me the beneficial that voices have a bit more body and not as clinically as the LM4562. Still waiting for my diskrete OP's.
About the plugin in Foobar where you can deside the upsamplingrate from 44100 to 96000. The 44100 deforms the Musik it's not worth to test it (but stil interesting to gamble with if sombody like to gamble).
 
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