eduardoo wrote:
> Just a little more update regarding My SBT EDO kernel #12 Esoteric K-03
> combo experiment.
>
> So far, operation seems ok, with the exception that the glitch I think I
> heard before is not a hallucination. Regardless of what sample rate
> material I was playing, every now and then I would hear for fractions of
> a second what seems like a variation in pitch. It is short, it is
> subtle, it is not what I would call a tick, and it sounds somewhat like
> the fingers on your left hand slipped a touch when you play guitar.
> Anyone else experience something like this before? It is not a life and
> death issue but I am just curious. Also, is it normal for the sample
> rate (when I check the status of the USB output) to show something like
> 959998 rather than 960000 every now and then? I didn't check for other
> sample rates but it was shown momentarily now and then when I was
> playing some 96K material.
>
> Thanks.
I have a similar experience when using kernels #11 and #12 with my Teac
UD-H01, which I bought about a month ago. It's like you described:
glitches every now and then, or faint pops. Sometimes it's like I missed
a note, sometimes it's like some note is done twice. Reminds me of
vinyl, but with vinyl you know when to expect these pops. With this,
it's random, and therefore (more) annoying.
SPDIF (coax or toslink) does not give me these pops, glitches, or
whatever you name them.
The -dmesg- command doesn't show anything which explains this. Also no
hints in /var/log/messages. The data in /proc/asound/card1/stream0 looks
fine. The DAC is reported as a High Speed device, working in Async mode
(the frequency fluctuates a bit, which is normal). Sound quality is fine
too (except for the pops, that is).
What I did so far:
- I have been playing with the priorities of the real-time processes,
using the -chrt- command. I can make it worse, but not better.
- I tried different buffer settings, they make a difference
sound-quality-wise, but the pops stay.
- I tried to use TT3.0 on top of EDO to disable wlan, display,
infra-red etc. I also tried EDO + TT3.0 + SBGK.
- I tried a bus-powered USB 2.0 Hub. But I learned from this forum, a
hub only fixes these kind of pops when using a USB 1.1 DAC.
- I swapped my Best Of Two Worlds SBooster power supply with the stock
wall wart one.
- I disconnected both the coax and toslink interlinks, so having a USB
only connection to the DAC. This to prevent ground loops etc.
- I used another USB cable (my default one is an Audioquest
Cinnamon).
All this does not solve the pops.
I know the DAC is not the issue here: When using my Teac with Windows 7,
using the Teac supplied driver, I don't experience these pops. (Although
I do see a lot of interrupts are generated, which consume up to 50% of
my CPU!)
Anyone else experiencing these pops with a Teac UD-H01 (or any DAC with
a Tenor 8802 chip)?
Anyone who found a way to get rid of these pops?
For now, I am forced to use SPDIF coax or toslink (also because the test
kernels cannot be downloaded for some reason), but USB gives me slightly
better results sound-wise.
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