[P701]

Keep your output volume at 99% and lower your input volume to desired amount.
Keep the signal with -1dB or less in RMAA.

 

[Samueru Sama]

Keep your output volume at 99% and lower your input volume to desired amount.
Keep the signal with -1dB or less in RMAA.

Yeah, but it is clipping: 

Spoiler: Warning: Spoiler!

 

 
And I got the same result: 

Spoiler: Warning: Spoiler!

 

 

[ClieOS]

Here is someone else RMAA result on Xonar DG: http://www.pureoverclock.com/Review-detail/asus-xonar-dg-audio-card/6/
 
Seems to behave well enough. Of course RMAA result from different measurement really ain't comparable, but it is an indication that your Xonar DG might not at its best during measurement while the card itself might be fine.

 

[Samueru Sama]

I noticed that using the ELE DAC with my Xiaomi Piston makes them sound worse and there's a huge Hiss.
 
I wonder if it is the DAC impedance output + the low Xiaomi impedance. I did not hear that with my other headphones. 681 Evo (32 Ohm), 668B (56 Ohm) and KSC75 (60 Ohm).

 

[ClieOS]

  I noticed that using the ELE DAC with my Xiaomi Piston makes them sound worse and there's a huge Hiss.
 
I wonder if it is the DAC impedance output + the low Xiaomi impedance. I did not hear that with my other headphones. 681 Evo (32 Ohm), 668B (56 Ohm) and KSC75 (60 Ohm).

More likely the DAC chip runs out of current. PCM2704 is never meant to driver a load directly.

 

[Samueru Sama]

Today I tried to measure the DAC output impedance, I tried... I couldn't get any proper results, when I try to get 1V my DMM goes crazy, it starts to measure 0.2V and 2 seconds later it is 3.5V xD. apparently the Hiss does not let the DMM works properly.
 
I also measured my Xonar DG output impedance, (that one was easy) It is 20.14 Ohm.

 

[ClieOS]

  Today I tried to measure the DAC output impedance, I tried... I couldn't get any proper results, when I try to get 1V my DMM goes crazy, it starts to measure 0.2V and 2 seconds later it is 3.5V xD. apparently the Hiss does not let the DMM works properly.
 
I also measured my Xonar DG output impedance, (that one was easy) It is 20.14 Ohm.

 
What kind of setting, load and test tone do you used?

 

[Samueru Sama]

   
What kind of setting, load and test tone do you used?

 
I used a 60 hz sine wave file (made with audacity), my DMM, and a 46 Ohm resistor. I also tried with a 100 Hz tone and these online calculators to make sure.
 
http://www.sengpielaudio.com/calculator-InputOutputImpedance.htm
http://www.raltron.com/cust/tools/voltage_divider.asp

 

[ClieOS]

   
I used a 60 hz sine wave file (made with audacity), my DMM, and a 46 Ohm resistor. I also tried with a 100 Hz tone and these online calculators to make sure.
 
http://www.sengpielaudio.com/calculator-InputOutputImpedance.htm
http://www.raltron.com/cust/tools/voltage_divider.asp

 
Seems alright. Since ELE doesn't have a gain stage, the PCM2705 DAC might not actually able to output 1V. I'll suggest you use 0.1V instead, as the actually voltage is less important. It is the ratio between load vs. unload that is important.

 

[Samueru Sama]

   
Seems alright. Since ELE doesn't have a gain stage, the PCM2705 DAC might not actually able to output 1V. I'll suggest you use 0.1V instead, as the actually voltage is less important. It is the ratio between load vs. unload that is important.

 
Yeah but my DMM can only measure one digit after decimal point. I tried to measure the Xonar with 0.5V and the first result was 0.4V and sometimes 0.3V. that's a huge difference. At 1V the result was always 0.7V. However the ELE Dac at 0.5V goes crazy anyway. xD

 

[scottanz]

Greetings to all
 
I do not have any pair of headphones that require the 600ohm output of the amplifier to power and thus the volume setting on through my ele-d02 is 3-4 on windows and I do not have much choice in volume variance.
 
How could I lower the output impedence? I have done research on making my own ER4P to S style adapter but have no idea what value of resistors or how should I even solder them?
2 serial and 2 parallel connected to ground?
 
Thanks in advance for any guidance by the experts here

 

[Shadowsora]

Hi, bumping this thread cause i got this http://www.ebay.com/itm/1PC-5V-USB-Powered-PCM2704-MINI-USB-Sound-Card-DAC-decoder-board-/361275171146? 
from an auction at 3.8 euros, if i am right this is a diy ele d00, any recommendation on what mods should i apply on this?
My soldering skills are "ok" but i am bad with choosing what resistor/transistor etc i should replace(I am more of a software guy ).

 

[drabina]

  Hi, bumping this thread cause i got this http://www.ebay.com/itm/1PC-5V-USB-Powered-PCM2704-MINI-USB-Sound-Card-DAC-decoder-board-/361275171146? 
from an auction at 3.8 euros, if i am right this is a diy ele d00, any recommendation on what mods should i apply on this?
My soldering skills are "ok" but i am bad with choosing what resistor/transistor etc i should replace(I am more of a software guy ).

If there are any mods available, your soldering skills have to be better than "ok". This board has all SMD components which are tiny. No regular caps to replace like the other boards. I would say, use it the way it is as the performance/price factor should be good if you paid only 3.8 Euros.

 

[Shadowsora]

  If there are any mods available, your soldering skills have to be better than "ok". This board has all SMD components which are tiny. No regular caps to replace like the other boards. I would say, use it the way it is as the performance/price factor should be good if you paid only 3.8 Euros.

Well, my 1st intention was to use it as it is, i will hone my soldering skills and use it as an experiment board when i get a more "premium" dac.
Thanks for the advice.

 

[drabina]

  Well, my 1st intention was to use it as it is, i will hone my soldering skills and use it as an experiment board when i get a more "premium" dac.
Thanks for the advice.

If you want to hone your soldering skills, I would get Starving Student PCBs from Fred (here on this forum) and build yourself the 12AU7 version of Starving Student headphone amp. I just finished mine in a cigar-box and it is a sweet-sounding small amp. Slightly off-topic but still relates to headphones and you can use your DAC to feed the SS amp.