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Gustard U12 USB Interface 8 Core XMOS chip
Mar 3, 2015 at 4:36 AM Post #781 of 3,700
sgbwill2 said:
I'm pretty sure 24 bit is commonly used in recording and production. 32 bit no, not currently but why not have audio equipment capable of this for the future if 32 bit recordings do come about? (even if the difference over 24 bit is inaudible to humans)
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You can of course produce a 1024 bit recording too if you want. But that's just adding zeros. There is no ADC or DAC device that can process even a *true* 24bit recording. And prolly will never be because true 24bit means 144db dynamic range and that sound level may actually kill a human being. And 32 bit (192db) will almost surely do if you somehow manage to play it.
Anyway, this is not the place for such discussions... try and read some in the science forum ... e.g. this first post http://www.head-fi.org/t/415361/24bit-vs-16bit-the-myth-exploded .. or this nice video http://youtu.be/nLEhfieoMq8.
 
Mar 3, 2015 at 4:55 AM Post #782 of 3,700
sodaboy said:
  @abartels That OCXO is pretty nice for its price, it reminds me of what this guy did with a Teradak converter:
https://onedrive.live.com/?cid=1EB7027489224A7D&id=1eb7027489224a7d!526&v=3
 
I'm still on the fence about the 3M stuff, but I'm interested. I'm still mulling on what areas need application, need to read up the spec sheet on that material as well.
 
@rb2013 The atomic clock stuff is pretty crazy lol. I'm a bit tin eared, I don't think I could appreciate the difference but who knows. If I had that kind of money I'd probably get TOTL headphones, I think mechanical distortion at the transducer is probably a bigger contributor than the rest of the signal chain at that point.
 
@prot I saw that Pulsar clock a while ago too on diyaudio. I had a chuckle because I couldn't imagine why an OCXO would be export restricted lol.
 
@the i2s discussion:
As for i2s, one needs to be very careful since there is no standard pinout. In fact, you can just assume that everyone is doing whatever the hell they want. For example Audio-GD and Yulong both have i2s through a RJ45 port. Same port no problem right?
 
http://www.audio-gd.com/Pro/diy/I2Skits/I2SEN.htm
http://yulongaudio.com/en/product_detail.asp?pid=23
 
But they are actually using completely different pinouts. And the Gustard U12 forgoes the RJ45 port entirely for an HDMI port. With something DIY like the Buffalo it's no big deal. However if you bought into a brand, you are pretty much stuck with it lol.
 
Thankfully if you have deep pockets and buy something $2k+, you wouldn't even need an external usb interface.
 
@gustard x20
 
I'm curious what the X20 will be like too. But I didn't wait to find out, I just bought the X12 since I doubt I could afford the X20 anyways.
 
My idle speculation on the X20:
 
- Integrated DAC/AMP combo, like the Yulong and Audio-GD offerings
- Possible balanced headphone out along with single ended, since people love balanced and it's all the rage (I still like SE lol)
- Around or slightly below $1k MSRP
 
OR
 
They could pull off something crazy that would excite me, like a pure DAC dual mono ES9018 implementation, kind of like what L.K.S. Audio did.
 
I still think they will just come out with an integrated DAC/AMP box that everyone loves so much. I think the vast majority of setups being sold are integrated boxes nowadays.
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I really don't think it will be an integrated device. Since they call it "a Flagship" i suppose it will be a dac with several parallel ESS9018 chips, or indeed at least one per channel.
Maybe even a BB1704 dac, but then it would be an expensive dac since those chips are expensive nowadays,,,
 
I hope we will get some more info real soon! 
 
Mar 3, 2015 at 5:01 AM Post #783 of 3,700
rb2013 said:
 
I just swapped the caps in my R2R DAC mod project from Mundorf Silver/Oil Supremes to Sliver/Gold/Oil Supremes - now that was $200 very well spent.  The midrange tonal richness and bass extension/definition just took a nice leap forward.  Not subtle.
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Have any pics to share with us? 
bigsmile_face.gif

 
Mar 3, 2015 at 7:07 AM Post #785 of 3,700
hgpsemaj said:
  I contacted huang_cs of 'Gustard Taobao' today. And, I enquired that could I order an U12 with OCXO36 clock, and their answer is NO. 
Too bad, I must exercise my tool set very soon.
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Hi,
 
Can you ask him when X20 will come out, and if there's some info about specs and pricing? 
biggrin.gif

 
Mar 3, 2015 at 7:32 AM Post #789 of 3,700
hgpsemaj said:
  huang_cs of Gustard Taobao informed me X20 is a DAC, the selling price is around RMB4,000 and expect to launch before 1st July this year.
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+1 Okay, thank you for the info!!!
 
Mar 3, 2015 at 9:14 AM Post #790 of 3,700
hgpsemaj said:
huang_cs of Gustard Taobao informed me X20 is a DAC, the selling price is around RMB4,000 and expect to launch before 1st July this year.
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Thx for the info. Just to make sure I do not screw the conversion again RMB=CNY=chinese yuan ?!
In that case 4000 is about $650. Which sounds pretty good for a device which is supposedly much better than the current X12.

And if you have an open line with Gustard, how about asking if it's feasible to use a hq OCXO in U12... and if they think it will bring any SQ benefits.
 
Mar 3, 2015 at 9:56 AM Post #791 of 3,700
prot said:
Thx for the info. Just to make sure I do not screw the conversion again RMB=CNY=chinese yuan ?!
In that case 4000 is about $650. Which sounds pretty good for a device which is supposedly much better than the current X12.

And if you have an open line with Gustard, how about asking if it's feasible to use a hq OCXO in U12... and if they think it will bring any SQ benefits.
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(i)   RMB4,000 is about US$650.
(ii)  huang_cs claims it is feasible to replace it by OCXO in U12.
(iii) He said Gustard would not provide any technical support for modification works.
(iv) At the end, I ask him do I need to adjust any voltage and/or parameters? In his reply, he said it depends on how specific our work.
 
Mar 3, 2015 at 10:27 AM Post #793 of 3,700
hgpsemaj said:
(i)   RMB4,000 is about US$650.
(ii)  huang_cs claims it is feasible to replace it by OCXO in U12.
(iii) He said Gustard would not provide any technical support for modification works.
(iv) At the end, I ask him do I need to adjust any voltage and/or parameters? In his reply, he said it depends on how specific our work.
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Manx thx again. Guess that is pretty much the expected answer.
Not a DYI expert but AFAIK the OCXO needs more power than TCXO. I would expect some power related tweaks are necessary: separate power source, diff regulators, etc.
I would advise you to try the www.diyaudio.com forum for that kind of stuff. And here some xmos clocking info from a similar device https://hifiduino.wordpress.com/2014/01/24/diyinhk-isolated-xmos-usb-interface/

Would be great if someone figures out a clocking mod that is reasonably easy and does not cost more than the U12.
 
Mar 3, 2015 at 10:56 AM Post #794 of 3,700
I raise the same queries to the OCXO supplier of Taobao couple of minutes ago. Our local time is 23:54, and I expect they would answer my query sometimes tomorrow.
Hopefully, It would gather more information for us to replace the OCXO / TCXO.  
 
Mar 3, 2015 at 1:11 PM Post #795 of 3,700
How about one of these http://www.iqdfrequencyproducts.com/about/press/2014/06/04/iqd-s-launches-new-±0-2ppb-ocxo-at-ims-2014/
0.2ppB stability. That taobao thing with 0.05ppM looks lame in comparison.
OTOH, one of those lil craps costs same as much as the U12. Add two of them plus other parts and labor and we have a $1K Gustard. TOTL though :)
 
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