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Old 10th November 2012, 04:48 AM   #1241
zoka959 is offline zoka959  Serbia
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Quote:
Originally Posted by Jjazz View Post
Hi

I present the project AYIA (in tribute to his "perpetrator", Smanz in Diyaudio forum)i. I have not made ​​myself, just so enjoy it.
It is a dual mono dac cv181 tube.

Princiales components are:

- 2 Reference 9018 Sabre DACs (Twisted Pear Audio)
- USB EXAU2I
- Analog output with Psavane cv181 tubes, capacitors Mundorf MCAP gold silver oil, transformer Sowter
- Inputs 1 USB (exau2i), 2 Digital coaxial (75 Ohm WBT), 1 Toslink, 1 BNC.
- Outputs RCA analog outputs (WBT) Balanced (Furutech)

The sound is realistic, three-dimensional (in untreated room) and detailed. I've never heard anything like it, and is still running.

The output selector allows dsd for exadevices dsd player.

People who have heard talk sound much better than more expensive commercial dacs (and is not cheap)

Is everything perfect, I just need to get exadevices Audirvana direct mode :-)

Some pictures:

Imageshack - img2078e.jpg

Imageshack - img2079n.jpg

Imageshack - p1010106il.jpg

Best, Jorge.
Jorge ,
how do you switch digital input to BUFFALO between MUX and EXA ( SPDIF and USB )
Zoran
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Old 10th November 2012, 06:03 AM   #1242
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Quote:
Originally Posted by exa065 View Post
Please post to this thread if you think you are interested to buy one. Indicate your preferences:
[LIST][*]ES9018, PCM1704 or a third party DAC.


Is it not possible to make this software selectable via the driver CP?

Whatever the end product please count me in for at least one.
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Old 10th November 2012, 07:03 AM   #1243
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I suggest that masses of the new exau2i, at least on the side of the connector are like the present, in order to upgrade our devices that we have version 1.

Best
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Old 10th November 2012, 09:47 AM   #1244
Telstar is offline Telstar  Italy
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Quote:
Originally Posted by exa065 View Post
Attached is an early version of the PCB. Please post to this thread if you think you are interested to buy one. Indicate your preferences:
  • ES9018, PCM1704 or a third party DAC.
  • Let us know your priorities - all in one board or multiple specialized products for lower cost
  • Asynchronous operation (only two clocks) or all clocks installed.
  • Two channel only, PCM only etc.

Cheers,

exa065
This is my wishlist:
-8-channel with pcm1704
-2MB+ fifo buffer (i think there is already in the current version but not sure)
-wsapi/KS driver support up to at least 384khz
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Old 10th November 2012, 10:45 AM   #1245
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My wishlist:

lower price.
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Old 11th November 2012, 03:49 AM   #1246
Bunpei is offline Bunpei  Japan
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Default USB High speed Line Isolation

I'd like to report two products, at up-steam and down-steam of exaU2I.
I hope exa065 will not delete this post as "Off-Topic" or "Opposing his idea".

1. Adnaco USB High-Speed optical isolator
In the early days of this exaU2I thread, RayCTech reported his attempt of isolating USB High-speed input and an improvement of SQ. However, his method seemed too proprietary and violating USB specification. No one might have reproduced it.
Besides, exa065's position was, according to my understanding, that the most effective isolation point was the I2S as he provided.

Recently, I could get a certain level SQ improvement by applying an optical isolation on USB High-speed 480 Mbps connection between PC and exaU2I with a USB spec compliant generic product.

The product is "Adnaco-S3B – USB 3.0 Over Fiber Optic Expansion System" .

I tried it with DSD256 and DSD512 stereo play and found no problems even on such a high speed data transfer.

2. ElectrArt's "DSD principle board" (DSD filter)
Based on my experiences, I think it's not easy to establish a stable play of DSD512 using such commercial DAC devices as ES9018.

I applied ElectrArt's board as a beta-tester and got a good result.
ElectrArt?Digital Audio??? ???????? 1bit delta sigma DAC (In Japanese)

His board simply filters DSD signals and output audible analog signals through FIR circuit and OP-amp circuit.
Here is a schematic.

I could play both DSD256 and DSD512 output from exaU2I without any harmful "unlock interruption" nor "digital burst noises specific to DSD".

In the uploaded picture,
A. at the upper-right, Adnaco USB extender board with a battery power
B. at the upper-center, exaU2I board with USB bus power from Adnaco board
C. at the upper-left, ElectrArt's "DSD Principle Board"

I hope this information is something useful to "DSD-orienting" exaU2I users.
Attached Images
File Type: jpg ExaWithAdnacoL.jpg (123.0 KB, 430 views)

Last edited by Bunpei; 11th November 2012 at 03:51 AM.
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Old 11th November 2012, 01:05 PM   #1247
labjr is offline labjr  United States
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I've always thought Thunderbolt optical cable would be ideal for isolation of digital audio. Also good for long runs of cable between computer and DAC. I'll be happy when Thunderbolt is as common as USB on every computer.
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Old 11th November 2012, 01:36 PM   #1248
exa065 is offline exa065  Canada
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Hello Bunpei,

Thank you for posting about this project. The DSD512 board is exciting.
I see the benefits of the optical link when a longer cable is required. In terms of isolation it is redundant. There is no point to isolate twice, I am sure that that this will have no sonic effect.

Beside the cost, optical isolation is great. If you want to take this experiment further, you can remove the GMRs from the exaU2I. This will reduce the jitter. It will be still higher than the jitter of the new exaU2I V3.

Note to the exaU2I users with ES9018 DACs - don't bother removing the GMRs - in your case removing the GMRs won't make any difference. ES9018 takes care of the GMR jitter, and replacing the GMR isolation with optical isolation will not present a rational improvement.
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Last edited by exa065; 11th November 2012 at 02:00 PM.
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Old 11th November 2012, 02:02 PM   #1249
exa065 is offline exa065  Canada
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Cool, looking at the picture I see that you've done it.
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Old 13th November 2012, 11:59 PM   #1250
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Quote:
Originally Posted by exa065 View Post
Attached is an early version of the PCB. Please post to this thread if you think you are interested to buy one. Indicate your preferences:
  • ES9018, PCM1704 or a third party DAC.
  • Let us know your priorities - all in one board or multiple specialized products for lower cost
  • Asynchronous operation (only two clocks) or all clocks installed.
  • Two channel only, PCM only etc.

Cheers,

exa065
I can definitely commit to ordering the PCM1704 version (although the suggestion someone else posted to make this jumper-selectable makes sense too). Cost is not that much of an issue. I'm not sure whether I would need synchronous operation -- asynch clocks only seems fine, unless synchronous has noticeably lower delay. I would need multichannel -- this is a major attraction of the exa boards.
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