The card is poorly designed, lack of engineering experience? I might have tried putting the card in another PCIe slot further from GPU or PSU. There should be some sort of catch, like sucking some stray EMI. Or the card is a dud.
A simple comparison, took my old saved results. First one is the EVGA, second my ZxR and the third is a PCM1794A based Dual Mono external DAC. 24/96, as we see 50Hz mains ripple reeks in doing external device test while using ADC of the internal card. I have an external ADC coupled via optical, so it is electrically isolated, but I am too lazy, as the plot doesn't differ that lot.
What we see? Creative has pulled every bit from PCM1794A and doesn't suffer being inside the PC as many glorify external DAC's(it's better only by a fraction), it doesn't matter, there are really bad devices everywhere, just pick your poison. Latter both has the same signature distortions, the Texan DAC does it by design for everyone, and cannot be rid of. Sill the AK4493EQ doesn't win versus a Texas Instruments device made around 2004. You can flush those 384kHz/32-bit modes like fake news, as it doesn't deliver better even on 24/96. Harsh, yea I am kinda sorry, but that's the data.
Personally I don't need to read the listening experience, I just need these graphs. If the ADC is working right. The card is overly bright, harsh due to sporadic distortion behavior, as a result of some rising noise past 3K, that's pretty unusual sight, right channel goes haywire even more and that's a HW fault(ADC or DAC part, I am guessing here). Someone may like it actually, if the headphones are with less sensitivity at the highs none will bat an eye. The results are really worse than Samsung Galaxy S8 mobile phone lol, but it ain't bad by any means, because phone outputs are lately pretty acceptable, I've attached result zip for the curious ones. Shame I've lost Xonar STXII results also, it died few months ago anyways, they were a bit better in some places, traded blows, because slightly different IC also.
MY RESUME -
For this damn price? I say this card is rubbish basing on the data we have here. Sorry EVGA, it is not worth more than 50$.
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