Occasional glitches in the audio (very short, momentary dropouts)

[bobkatz]

I have a further development. Vanity pro --- quite serious dropouts at 44.1 kHz. I tried playing an audio CD from the HDMI output of either of two different Blu Ray players and in both cases, Vanity just can't handle it, lots of dropouts. I conclude that your "PLL" is too "stiff".... intolerant of any incoming sampling frequency issues.

[AP]

Hi seevic,
We are about to release a new firmware with further improved buffer control and frequency tracking, which should improve the playback even with ESS chips with fairly low DPLL settings. The DAC204 might need a firmware update which I believe Weiss will be happy to do. Please let them know and ask what the best approach would be. They know our products and managed to update their DACs before to work well (at that time for the Vanity203HD). If the dropouts are clearly related to the 20% and 80% buffer points then it is always the downstream DAC which has DPLL set too low.
Regards,
Pavel


seevic Wrote:
-------------------------------------------------------
> Hi Pavel
>
> Just want to add my 2 cents since I'm in a similar
> situation. I have two chains with a headphone
> system. When I'm using Mac Pro->VanityPRO->Weiss
> DAC204, the dropouts barely happened, maybe every
> 30mins or even longer, it's definitely listenable,
> but that was only improved by the latest firmware
> upgrade. My second chain is the recently added
> Eversolo A6 ME->Vanitypro->Weiss DAC204, it drops
> about every 5 mins, and did happen when the buffer
> hits 20%/80% threshold. And I'm using the same
> Fibbr 8K HDMI cable.
>
> So maybe the dropout has sth. to do with the
> source as well? I can't find any way to adjust the
> DAC204 PLL BTW.
>
> Cheers.

[Milan]

Hello Bob,

May I ask you to take a video of the VPRO status screen while you are getting those dropouts? With this data we could see more details and do the first analysis. Thanks.

Regards,
Milan

[bobkatz]

Hi, Milan. Thanks for your reply and your effort on the new firmware... last time i looked at the status screen, the occasional dropouts did not occur in sync with being near the 20% and 80% buffer points. I would like to try the new firmware and see how it does. I have to move the box upstairs and hook it up to my only remaining windows 10 machine so that's a pain, but if you think the new firmware will help these occasional dropouts I will try.

What do you think about my reactions to 44.1 kHz sample rate? It was totally unuseable, dropouts every 10-15 seconds.


Bob




Milan Wrote:
-------------------------------------------------------
> Hello Bob,
>
> May I ask you to take a video of the VPRO status
> screen while you are getting those dropouts? With
> this data we could see more details and do the
> first analysis. Thanks.
>
> Regards,
> Milan

[Milan]

Hello Bob,

quite werid behavior that only on 44.1kHz. Can you confirm the others FS are ok? Have you had that issue ever before when you bought your VPRO or it just started to happen recently? Anyhow you can make a short video of the status screen while the dropouts are present it would give us some feeling.

Thanks, and regards,
Milan

[AP]

Hi seevic,
I have checked this with the engineers from Weiss and there is a jumper on the main board to change the setting of the ESS DAC in order to relax the jitter attenuation bandwidth, which is apparently causing the dropouts. Can you please check your unit has this header with one jumper? If so, you can try to change the position of the jumper as indicated in the picture below.
[img]https://audiopraise.com/img/temp/ESS_config_jumper.jpg[/img]
Best Regards,
Pavel

seevic Wrote:
-------------------------------------------------------
> Hi Pavel
>
> Just want to add my 2 cents since I'm in a similar
> situation. I have two chains with a headphone
> system. When I'm using Mac Pro->VanityPRO->Weiss
> DAC204, the dropouts barely happened, maybe every
> 30mins or even longer, it's definitely listenable,
> but that was only improved by the latest firmware
> upgrade. My second chain is the recently added
> Eversolo A6 ME->Vanitypro->Weiss DAC204, it drops
> about every 5 mins, and did happen when the buffer
> hits 20%/80% threshold. And I'm using the same
> Fibbr 8K HDMI cable.
>
> So maybe the dropout has sth. to do with the
> source as well? I can't find any way to adjust the
> DAC204 PLL BTW.
>
> Cheers.

[seevic]

Hi Pavel
Thanks for following up! I've checked with Mr. Weiss as well and he told me my unit was the first batch, so doesn't have that jumper. I have to send it back to Swissland to update it. I haven't decided yet as your firmware upgrade solved most of the problem (80%).

[AP]

Hi Seevic,
We are happy to help! I am glad to hear that the new firmware has positive effect on reducing the glitches and dropouts.
Regards,
Pavel

[seevic]

No worries, I hope the next firmware can solve it 100%:)-D

[bobkatz]

Dear Pavel: It's September. My Vanity Pro is on HW Version 1, SW System 5.2.1 SW FPGA 6 and SW HDMI 35A1. It still glitches about once every 5 to 10 minutes. Will you be having any Firmware updates to try to smooth out these little glitches?

I see that I am one firmware version behind, and that 5.3 is supposed to improve the glitch situation. Is this updatable from Windows 11? The last time I checked, it was only updatable from Win 10

Hoping you are close. Thanks,

Bob