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AK4490 USB Dac with dsd support.
AK4490 USB Dac with dsd support.
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Old 7th January 2018, 01:13 PM   #1501
darbost is offline darbost  Indonesia
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Join Date: Jul 2010
hi Sonny
Please reply my email
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Old 7th January 2018, 07:46 PM   #1502
Joseph K is offline Joseph K  Hungary
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Join Date: Dec 2004
Location: gran sasso
Given that the talk turned to the quality of clocks in these dacs..
Here I would like to show a little test that I wished to do.

With this new arrival, the SITO V. 1.2 dac equiped with very good quality clocks, dedicated power supply, & galvanic isolation - I had been wondering if one would be able to detect any measurable changes due to this. I mean any change from the previous model Mirand V 1.1 dac to the SITO dac.
The old model, as we know, is based on Fox Xpresso crystals, have a mixed power supply scheme and is not isolated galvanically.

It looked to be not that easy because the usual jitter tests already for the Mirand dac looked quite clear.

So I tried to push the setup to the limits.

I drive the DUT dac modules into my usual EMU1616m card with AK5394A.
The dac is piloted in upsampled PCM mode, set to 384kHz -so as to stress as much as possible the jitter response.
The sound card is used instead in it's cleanest mode, 48kHz/ 24bit recording.

The first shot is the Mirand V 1.1 original version.
The second shot is the SITO V. 1.2 new version, tested on it's USB input, with USB power external.

Last edited by Joseph K; 7th January 2018 at 08:09 PM.
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Old 7th January 2018, 08:06 PM   #1503
Joseph K is offline Joseph K  Hungary
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Join Date: Dec 2004
Location: gran sasso
The samplng rate is 48kHz multiples, so the test signal is FS/4 frequency, 12kHz tone.
Almost full scale.

In the first graph , the un-isolated Mirand dac shows an obvious modulation at the standard 8kHz high speed USB frames frequency; plus a series of spurs at 1kHz distance, 1msec USB packet signaling.
The 4,5-4,6kHz side lobes most probably are due to the Fox oscillators.
There is a non- zero contribution also from the soundcard itself -- those spurs at 1.5kHz and at the top freq.range. one can observe all these still present also in the SITO spectra.
On the other hand, the SITO V. 1. 2 spectra shows a much cleaner picture, almost all USB correlated signatures are gone, mainly the soundcard related residuals are left only. (And a spur tone at 2kHz, plus a little 50Hz contamination )

So, I would say that the choices made by Sonny - - are working..

Ciao, G
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Old 16th January 2018, 10:56 AM   #1504
AnthonyA is offline AnthonyA
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Join Date: Aug 2017
Quote:
Originally Posted by Aboe View Post
Hi

To cut the internal 5v, just follow the red arrow and cut the leg at the NTE0505.

Then just set the external 5v at the pins in the red cirkel - red is plus 5v and black is minus.

cheers Anders
Thanks. That's scary... Cut it really.? So it's pin 1 right?
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Old 16th January 2018, 10:59 AM   #1505
AnthonyA is offline AnthonyA
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Join Date: Aug 2017
Quote:
Originally Posted by vitalica View Post
Sonny, would it be a benefit if i would use separate Salas shunt PSU for Crystek clock?
Until now, the DAC V1.1 sound is great and I really like it. It's great that I can use USB or I2S inputs.

Thank you.
Wow.. Super built. How did the salas bib work out for u vantalika?

I personally using the reflector d for digital only
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Old 16th January 2018, 11:46 AM   #1506
vitalica is offline vitalica  Europe
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Join Date: Feb 2005
Quote:
Originally Posted by AnthonyA View Post
Wow.. Super built. How did the salas bib work out for u vantalika?

I personally using the reflector d for digital only

In this configuration I heard the most natural sound in my system.
PSU Salas made a huge change for the better.
With Salas BiB I separately feed I / V and preamplifier.
With Salas ReflectorD - Mirand DAC.
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Old 16th January 2018, 03:14 PM   #1507
AnthonyA is offline AnthonyA
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Join Date: Aug 2017
Quote:
Originally Posted by vitalica View Post
In this configuration I heard the most natural sound in my system.
PSU Salas made a huge change for the better.
With Salas BiB I separately feed I / V and preamplifier.
With Salas ReflectorD - Mirand DAC.
Great to hear. Will try to build it. Have the bib board but was being lazy. Thanks for the review

Your built looks so delicious. Yumm

Last edited by AnthonyA; 16th January 2018 at 03:33 PM.
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Old 17th January 2018, 08:59 PM   #1508
Aboe is offline Aboe  Denmark
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Join Date: Jan 2015
Default Pin 8

Hi

Itís actually pin 8 - see picture

Quote:
Originally Posted by AnthonyA View Post
Thanks. That's scary... Cut it really.? So it's pin 1 right?
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Old 19th January 2018, 01:32 AM   #1509
AnthonyA is offline AnthonyA
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Join Date: Aug 2017
Quote:
Originally Posted by Aboe View Post
Hi

Itís actually pin 8 - see picture
Okay thanks aboe
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Old 9th February 2018, 04:07 AM   #1510
ravid is offline ravid  India
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Join Date: Feb 2011
Hi Sonny

Hope you are doing good.

My dac is sounding very well, better than some of r-2r dac's my friends own. However there is a small glitch when playing DSD using Allo USB Bridge as Roon end point.

When I play DSD 64/128 native I get no sound or sometimes buzzing sound from my speakers. When I cycle through the filters it picks up again and starts playing till I power off the dac. Any idea what could be the reason? I don't have any problems with PCM.

It's running the same firmware I got with the dac. The links to newer firmware you shared were not working. My marantz SA8005 CD player which also works as a USB DSD dac doesn't have this problem.

Any help would be appreciated.

Last edited by ravid; 9th February 2018 at 04:18 AM.
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