Click to view our Accessibility Statement or contact us with accessibility-related questions
Showing 1 of 326 conversations about:
Techland
27
Dec 24, 2016
bookmark_border
I missed this drop so just got this unit via Amazon. And I am not happy. The digital filters can be switched, shown on the display as PCM 1 to 4. But nothing changes in audio. I have the tools to measure frequency response as well as impulse response. Both change significantly and easy to measure when doing this with a Teac UD-503 (it also uses the AK4490 and such offers the same filter selection). But nothing changes with the XD-05, it always works with filter 'Short Delay Sharp'.
I fear that this is a bug in the hardware that can not be fixed, an example of typical chinese development and testing skills (read none).
Of course I have sent two messages to service@xduoo.com and one through the official Amazon channel, on 20 Dec and 22. So far no one replied.
Dec 24, 2016
JCruk
108
Dec 24, 2016
bookmark_border
TechlandWhich input are you using? The filters don't work with USB input, only with optical/coax.
Dec 24, 2016
erniehoff
6
Dec 24, 2016
bookmark_border
TechlandGood luck getting a response from them...........
Dec 24, 2016
Techland
27
Dec 25, 2016
bookmark_border
TechlandI re-examined the unit today in detail, also to address some of the replies to my post.
@JCruck: Sorry, but you are wrong. The filters are part of the DAC chip, and that chip doesn't even know where its input signal is coming from. It seems you got confused with the sample rate conversion, which indeed is only available on the digital input, not USB.
@ myself: Further examination of the problem now even more points to a serious firmware flaw. The unit behaves differently between USB and digital input SPDIF:
USB: PCM 1 and 3 are Short Delay Sharp, PCM 2 and 4 are Short Delay Slow. Changing from PCM 1 to 2 'Slow' is activated for less than half a second, then the unit activates SD Slow. The same happens when switching from PCM 4 to 1, 'Sharp' gets active for less than half a second.
SPDIF: SD sharp is active all the time, no matter what is selected. Here also other filters can be seen for a very short time after switching through PCM 1 to4.
SRC: I have to add this feature as it reveals another flaw. Playing back 44 kHz with SRC off, it seems the SRC is not off. The signal looks somewhat deformed on a sample-level. Maybe the SRC is then still on and not properly bypassed - I can't say what exactly is happening. It just looks awful on a DSO to see the impulse response with high-frequency distortion on it. This is immediately solved when using the SRC, so upsampling to 192 kHz as standard operational mode for listening to digital sources would be the way to go.
All of the above is 100% reproducable on my unit. As a technician it seems clear to me that such behavior can not be caused by simple manufacturing errors, like contact problems or defective chips. This looks like a firmware bug, and I would not be astonished if all ever produced units have the very same problem.
And now that I wasted all my time with this I stumbled over the proof of my theory, on a russian website which hosts lots of XD-05 measurements. They show the exact same (wrong) impulse responses for the filter types with PCM 1 to 4.
http://reference-audio-analyzer.pro/en/report/dac/xduoo-xd-05-pcm1-spdif.php http://reference-audio-analyzer.pro/en/report/dac/xduoo-xd-05-pcm2.php http://reference-audio-analyzer.pro/en/report/dac/xduoo-xd-05-pcm3.php http://reference-audio-analyzer.pro/en/report/dac/xduoo-xd-05-pcm4.php
Makes me wonder if Massdrop will show any responsibility and force xduoo to provide a firmware bugfix...
Dec 25, 2016
davedm
3
Dec 26, 2016
bookmark_border
TechlandYou should also post this on head-fi.org to get more coverage. There is a thread dedicated to xd-05 there. (http://www.head-fi.org/t/789886/xduoo-xd-05-portable-dac-amp-introduction-impressions/720)
Dec 26, 2016
Techland
27
Dec 26, 2016
bookmark_border
davedmDone. I also posted DSO screenshots of the assumed SRC problem in that thread.
Dec 26, 2016
Justin_1
29
Dec 30, 2016
bookmark_border
Techlandway to respond man! thanks for all the info, I have one on the way and this will help a lot. Thank you so much!
Dec 30, 2016
Justin_1
29
Dec 30, 2016
bookmark_border
davedmI hope he does.
Dec 30, 2016
Greatsouls
34
Jan 2, 2017
bookmark_border
TechlandJust curious, when you change from PCM 1 to 2 and it reverts back to 1, do you also see that on the display? Mine stays at / shows on the display whatever has been selected - 1, 2, 3 and 4. It does not revert back to 1 / 3
Jan 2, 2017
Techland
27
Jan 2, 2017
bookmark_border
GreatsoulsThe display does not revert back. It shows what one expects.
Jan 2, 2017
Greatsouls
34
Jan 3, 2017
bookmark_border
TechlandThat explains why I can't hear any difference... Thank you.
Jan 3, 2017
View Full Discussion
Related Products