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don't trash your TEAC UD-H01 DAC, pimp it!
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Old 18th December 2018, 10:45 PM   #21
mige0 is offline mige0  Austria
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A consequence of above measurements is, that what TEAC did advertise obviously does not hold.
They stated that incoming digital signals always will be upsampled to 192kHz to gain from smoother reconstruction filters
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Old 18th December 2018, 11:04 PM   #22
mige0 is offline mige0  Austria
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Now to some quirks I stumbled across, regarding on how Linux / Ubuntu seems to interact with the TEAC, fed from PulseAudio versus ALSA sound layer.

What can be seen on that measurements is, that digital streams from PulseAudio are interpreted by the TEAC one by one.
On signals with high crest factors, such as a square wave for example, hard clipping occurs.

On the other hand TEAC or more probably even ALSA at Linux / Ubuntu incorporates kind a soft clipping mechanism not to allow digital 0dB signals with high crest factor to go into clipping at all.
At around digital -6dB, signals from ALSA still are compressed as can be seen.
Not really bit perfect I'd say.

Last edited by mige0; 18th December 2018 at 11:34 PM.
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Old 18th December 2018, 11:18 PM   #23
mige0 is offline mige0  Austria
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The last quirk I came across is something that became immediately evident at looking at the scope when playing at different sample rates.
At 44kHz the traces did literally walk and wobble quite obviously.
So I set up for measurements that capture envelopes.
Have fun!

Wobble, or most probably jitter created by synchronous USB streaming, is heavy at 44kHz, better already at 48kHz and best at 192kHz.
For easy comparison the last pix shows 192kHz with envelope mode disabled.

If my interpretation is correct, then what TEAC did advertise for the UD-H01 obviously does not hold.
They stated that incoming digital USB signals always will be received in asynchronous mode, exactly to avoid such jitter.
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Old 19th December 2018, 08:13 PM   #24
weissi is offline weissi  Austria
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Well, there are proven solutions, albeit off topic... Amanero, WaveIO, JLsounds, and a hole lot of chinese copycats with Xmos. Also available are upsampling solutions based on AK4137, not to mention all those ESS DACs that will always upsample.
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Old 22nd December 2018, 01:12 PM   #25
mige0 is offline mige0  Austria
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Quote:
Originally Posted by weissi View Post
Well, there are proven solutions, albeit off topic...
Upsampling isn't really a problem. Can do a batch convert with dBPoweramp to any sampling format I like to force feed the TEAC with very easily.
As for the assumed USB jitter, I am currently digging some deeper by ARTA measurements, but at such sub Hz frequencies its really hard to get meaningful results even if jitter is as pronounced as it seems to be from my scope's measurements.


Got the OPA1620 EVAL board.
What a grotesque waste of resources, shipping such a tiny board over the pond by such big parcels!
Most possibly will try it with balanced signal pic up directly at the motherboard and a DACT style shunt pot for volume control.



Despite the measured quirks mentioned before, the UD-H01 already has very good SQ to offer.
Even with dreadful MP3 web streaming it sounds quite astonishing.
Where the TEAC UD-H01 begins to shine though, is with playback of true highres audio recordings, say 24bit / 192kHz.
Clearly discernible from a 16bit / 44.1kHz red book pressing.
The higher sample rate helps in smoothing out the upper registers and the higher bit rate helps in letting you dive deeper into the presentation, a big step forward towards an analogue feeling in short.

To get there the easiest way, I highly recommend to give mature Daphile a try on a spare notebook or barebone. Daphile was written by a Finn based on ArchLinux.
Daphile – Digital Music Convenience for Audiophiles
https://www.daphile.com/download/Dap...stallation.pdf
Daphile - Audiophile Music Server & Player OS

You can get it up and working nicely in about half an hour, having at hand the right installation ISO, a second PC in the same network, IP and sub net mask for the router and DNS server.
I got away with an old Lenovo N500 Notebook plus SSD and 1GB ram right "out of the box".
Its best to do installation with the DAC already connected to the USB port, to allow Daphile to recognise it at setup routine. If possible, disable internal soundcards in BIOS before setup.

As installation of Daphile is that easy and straight forward, I even tried on an ATOM CPU based Eee-PC, but possibly would need some deeper research into the advanced audio (buffering) settings to iron out glitches that did occure now and then with such a low horse power setup.

To avoid clipping of hot recordings under any circumstances, I recommend to set "attenuation" in the advanced audio settings to -3dB.

Daphile can be configured to be operated remotely by a second PC, or some apps, or directly at the PC you installed it to, or even by the comfortable Slimdevice Duett controller.
https://www.logitech.com/images/pdf/...x_Duet-ENG.pdf
Attached Images
File Type: jpg TI_resource_waste.JPG (261.8 KB, 39 views)
File Type: jpg Daphile.JPG (180.0 KB, 50 views)

Last edited by mige0; 22nd December 2018 at 01:31 PM.
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Old 23rd December 2018, 01:46 PM   #26
mige0 is offline mige0  Austria
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Quote:
Originally Posted by mige0 View Post
Upsampling isn't really a problem. Can do a batch convert with dBPoweramp to any sampling format I like to force feed the TEAC with very easily.
With Daphile it "should" not even be necessary to batch convert my library as it can do up-sampling on the fly by itself, either to the max sample-rate or to max sync sample-rate.

Drawback is that it does not work out as one would expect.

In the plot below we see that we do not gain from TEACs improved reconstruction filtering at higher sampling frequencies nor do we gain from the less jitter seemingly associated to that.

The measurement was taken by feeding the TEAC with a by Daphile up-sampled -6dB square from 44.1kHz to 176,4kHz.
TEAC USB DAC does correctly indicate an incoming signal of 176,4kHz.
The scope this time was set for single triggering to also show the weirdness going on with the assumed USB jitter.
Attached Images
File Type: jpg weird_jitter.jpg (120.4 KB, 50 views)

Last edited by mige0; 23rd December 2018 at 01:54 PM.
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Old 23rd December 2018, 03:08 PM   #27
mige0 is offline mige0  Austria
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Above measurement was taken with Daphile up-sampling set to use minimum phase response.

Things sort of improve with Daphile up-sampling set to use linear phase response.
With this setting, we at least gain from the better reconstruction filtering of the TEAC DAC at higher sample rates, but its superimposed by pre-ringing, most probably due to Daphile's up-sampling set to use linear phase.

As for the assumed USB jitter one can see from the cursor readout that single elongated periods translate to 980-990Hz instead of spot on 1kHz.
Exactly the same behaviour as with the measurement taken above.
Attached Images
File Type: jpg preringing_elonged_periods.jpg (94.3 KB, 32 views)

Last edited by mige0; 23rd December 2018 at 03:10 PM.
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Old 28th December 2018, 12:16 AM   #28
mige0 is offline mige0  Austria
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Finally got some decent sound out of the OPA1620 EVAL board driving my AKG K701.

By far the best results I got when connected directly and symmetrically to the I/V MUSES 9820 out. Worse was to feed it by the XLR out and worst was to feed it asymmetrically from that point of the mobo where the original headamp pics up its signal.
In addition to that, one interesting observation was that quite in contrary to the stellar PSRR specs this OPA1620 is very picky for its supply.
A fist attempt with polarized 100uF Nichicon Muse 100uF / 50V as blocking capacitors right at the board showed severely compromised PRAT by an overly liquid presentation.
Switching to 1000uF Nichicon FC parallel by 100nF MKT and some pF silver MICA did the trick.
Not quite as refined and balanced as I would like to have it after a few hours of break in, but now definitely heading into the right direction: high resolution, good attack and way better resolved tails.
Also my subjective feeling is that channel separation isn't all that great as could be expected from specs. Would possibly gain further from a split PS arrangement.

As this reservoir cap trick did work out surprisingly well, I assume the rails simply are inadequate regulated. Done by fix voltage 3-pin regs as far as I can see.

I'll try to do the reservoir cap trick at the I/V MUSES 9820 in a next iteration. Lets see what it brings up.


Another direct consequence of above observations is, that the XLR driver stage has potential to be improved by quite a margin.
Attached Images
File Type: jpg IV_signal_pic_up.JPG (297.4 KB, 46 views)
File Type: jpg OPA1620_EVAL_1.JPG (211.3 KB, 49 views)
File Type: jpg OPA1620_EVAL_2.JPG (205.4 KB, 44 views)

Last edited by mige0; 28th December 2018 at 12:40 AM.
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Old 28th December 2018, 03:44 PM   #29
weissi is offline weissi  Austria
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Is it that all those 47uF have holes for THT capacitors beneath them? At least it seems so looking at the first pic.
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Old 28th December 2018, 05:52 PM   #30
mige0 is offline mige0  Austria
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Quote:
Originally Posted by weissi View Post
Is it that all those 47uF have holes for THT capacitors beneath them? At least it seems so looking at the first pic.
yes, always rotated by 90deg.



Speaking of channel separation, spaciousness and "3D" rendering.

One of the most crazy things I came across recently was about galvanic isolation of the USB DAC data stream from its feeding PC.
No one does have any good 'ol school explanation from an engineering point of view, as to why this could make any difference at all, given the fact that non of the digital data gets lost on transfer and clocking anyway is done at the DAC side.
Nevertheless becoming curious, I decided to simply give it a try, neither going with the scientists camp nor with the esoteric one. Especially as Intona sold some of their ugly, white version plastic boxes at a discount via Ebay.

To much of my surprise, the TEAC UD-H01 easily let me differentiate the sonic footprint of the USB connection, or better the absence thereof, when the Intona USB 2.0 Hi-Speed Isolator (Standard Version 1kV) is up-streams to the DAC. Most apparent with complex, highly dense material as for example from the shown album.
A great way, to crank SQ of that cheap to have DAC another step.

Have fun!
Attached Images
File Type: jpg Intona_1.JPG (221.0 KB, 36 views)
File Type: jpg Intona_2.JPG (204.5 KB, 28 views)

Last edited by mige0; 28th December 2018 at 06:06 PM.
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