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AK4490 USB Dac with dsd support.

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#1,502
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.
 

Attachments

  • MirandV10_12k_384ksmpl_emu48ksmpl_fullgraph_jitter.png
    MirandV10_12k_384ksmpl_emu48ksmpl_fullgraph_jitter.png
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  • SITOV12_12k_384ksmpl_emu48ksmpl_fullgraph_jitter_okt15_No_display_2ndtake.png
    SITOV12_12k_384ksmpl_emu48ksmpl_fullgraph_jitter_okt15_No_display_2ndtake.png
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#1,503
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
 
#1,510
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.
 
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