Hi,
thanks for the very detailed review
@amirm, although that drop in high frequencies at 5khz concerned me, I still bought this one instead of the Fiio to drive my DT 880 headphones as I've read positive reviews everywhere and it has more output power. What wondered me the most is that you said that it sounds great, although the analysis says something quite different.
When I got it, I was impressed by the sound. Thats why I made an own analysis to confirm or deny what you found out. My hypothesis was that there is some postfiltering after the DAC stage going on depending on the sample rate at which the device is used.
My capabilities are by far much more limited, what I did is:
- I generated several wav files with white noise ranging from 32khz up to 96khz.
- I plugged the headphone jack into my cheap onboard sound card. I know that this is not the best option to test something, but the only thing that interested me is the difference at different sample rates and that should be clearly visible even though the recording device is very cheap
- I then set the DAC X6 to a specific sample rate and played back my white noise files matching that sample rate and recorded the result at 192khz
What can I say, even at 32khz the drop off in high frequencies is not as high as I expected and the drop is moved upwards when a higher sample rate is used, as I expected.
Some FFT prints following:
32k
View attachment 29731
44k1
View attachment 29732
48k
View attachment 29733
88k2
View attachment 29734
96k
View attachment 29735
Not exactly knowing why, but I used it in Windows and I can't set it to a sample rate higher than 96k, but to be honest I expect the picture to be identical at even higher sample rates. A drop off starting at about 3/4 of the usable frequency spectrum.
If anyone wants to review my files, I uploaded the recordings at
https://nilsschneider.de/temp/whitenoise_test_dac_x6.zip
My resume: Great device, safe to buy and very decent sound!