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Old 22nd February 2012, 12:59 AM   #31
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That's nice to know, I am just not trusty into those mini-jack inputs.
E-MU121 uses as A/D converter AK5394A.
Equal (on paper) to the ADC in XONAR DX2 (CS5381).
I will "hunt" something on eBay.

Last edited by SoNic_real_one; 22nd February 2012 at 01:07 AM.
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Old 22nd February 2012, 11:08 AM   #32
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Question 32 DAC chips?

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Originally Posted by Bernhard View Post
Click the image to open in full size.

All removed from old cd players.
Chips from recent production could look different.
I have another 32 pieces in my DAC, some made in PhilipPines.
Hi Bernard, you are using 32 DAC chips parallel?? Or "staggered"?
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Old 22nd February 2012, 03:08 PM   #33
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Quote:
Originally Posted by SoNic_real_one View Post
That's nice to know, I am just not trusty into those mini-jack inputs.
E-MU121 uses as A/D converter AK5394A.
Equal (on paper) to the ADC in XONAR DX2 (CS5381).
I will "hunt" something on eBay.
There's nothing wrong with mini-jacks

Asus also use the CS5382 in their flagship cards, one of which I own and I can testify towards the quality of the line input.

Finding RMAA measurements for the EMU is harder then for the Xonar range, but of the one limited test I did find the EMU did fine.
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Old 22nd February 2012, 03:28 PM   #34
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Quote:
Originally Posted by QSerraTico_Tico View Post
Hi Bernard, you are using 32 DAC chips parallel?? Or "staggered"?
2 x 8 parallel / balanced per channel
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Old 22nd February 2012, 11:15 PM   #35
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Quote:
Originally Posted by 5th element View Post
Asus also use the CS5382 in their flagship cards...
You mean CS5381 I guess? They don't make 5382...
A/D Converters
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Old 23rd February 2012, 12:32 AM   #36
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Yes indeed the 81.
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Old 3rd March 2012, 10:35 PM   #37
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I did aquire a better sound card. E-MU 1820 (same PCI card as 1212 or 1616 but with a different external dock).
I re-measure (at 96kHz samplerate) the PCM61 at 0dB and -60dB and I did a loopback test on the new card (not ballanced thou, didn't have cables for that). I am happy that at lest I have a nice audio measuring tool now. And my PCM61 does not "look" that horrid anymore

PS: That E-MU "Patch DSP" is kicking my butt... Not an easy setup like any other regular soundcard.
Attached Images
File Type: png 0dB.PNG (126.2 KB, 74 views)
File Type: png -60dB.PNG (123.9 KB, 68 views)
File Type: png EMU1820.PNG (105.7 KB, 69 views)

Last edited by SoNic_real_one; 3rd March 2012 at 11:00 PM.
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Old 4th March 2012, 12:29 AM   #38
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Much better performance. The loop-back is nice too, the calculated THD measurement is being clouded by the hash above 20k though.
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Old 4th March 2012, 01:08 AM   #39
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Correct, I did extend the measured range on purpose. That raise over 20kHz is noise shaping - the difference between a Delta-Sigma DAC (the one in my E-MU dock is CS4392) and a Multibit one (PCM61).
Weird thing is that the odd harmonics on PCM61 are bigger than the even ones.
Also you can see in the first pic, past 20kHz, where the noise floor of the PCM61 drops (filtered, no more analog signal past that) to remain only the level of ADC noise.
PS: In my dock ADC is PCM1804 and OpAmps are NJM2068. I didn't know that only in the "m" versions they have AK5394 (with same OpAmps).

Last edited by SoNic_real_one; 4th March 2012 at 01:32 AM.
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