Yes. FFT.what do you mean "try"? Do you want I check FFT with your wav files?
Yes. FFT.what do you mean "try"? Do you want I check FFT with your wav files?
What the hack. I need to check if my files are clipping.
Supposedly there should be modulation noises/ artifacts in the spectrum, which are not shown with other dac chips, like cs4398. Something like this.it was my fall, the player had extra gain, sorry. You know what, I using iso-trafo and ADC for that FFT, I don't think if the resolution will be enough(at 20Hz trafo for sure is bad, @1KHz THD .0002%) to see 9038 artifacts yet. My AP is blind SYS2702 and has no FFT at all.
Does one mode has higher modulations? I mean, the hump doesn't seem to completely gone with the other mode just less prominent/ lower than noise. I think that's crafted in the ess architecture.yes, I see that and without 30Hz these nails disappear too. I see these artifacts in both mode i.e. with/without hump.
View attachment 25736
Sure. In my measurements they don't present on ak4493 or cs4398.I didn't notice any difference yet, I want to try the test AK4490 as well.
Probably try -6db output gain.Hah, my 4490 has it )) Need to chek if iso-trafo affect that or ADC(CS5381 with OPA1612 frontend)
Hi there, I do not follow that thread but if anyone interested in the root cause of that "hump" phenomenon I have to show something. The attached plot is power sweep vs THD+N my tiny ES9038Q2M USB->DAC->HPA dongle on real planar headphones loaded Fs=44.1kHz 24b. 100MHz named curve correspond reg#0 value 2’b00: MCLK = XI (default), 25MHz at 2’b11: MCLK = XI / 8. As you can see the blue 100MHz curve has no hump at all, and you can ask me why some DACs uses lower MLCK value? Check this out(note: FFT after 40db notch), harmonics distortions
distribution is quite different for 100MHz vs 25MHz, however THD+N very close for both modes. 25MHz mode has nearly perfect harmonics set - 2, 3, 5.. and nothing more, then 100MHz has lot's of small nails at 15, 17 and 19khz. I made some buttonless "easter eggs" hidden interface for my #9038S USB->DAC->HPA dongle to let user switch between 3 modes:
1) Normal-mode 100MHz
2) Performance-mode 25MHz
3) SE-mode 100MHz+.25% of 2nd harmonicView attachment 25726View attachment 25729View attachment 25730