Topic: Sharp filter weirdness
Hello, I'm using akm version of the dac, I have tried sd filters but none of them sounded that good, after checking the manual I switched to sharp since it is supposed to be the most reference sounding one, but weird thing happens if I use it in combination with focal elear, from time to time there's noise in the background that sounds kinda like old crt screen, it's most noticeable on electronic music in general, but especially in NES games, If I continue listening when I notice it I get tinnitus on one ear and after a while I get it on other ear too, and it lasts for hours, sometimes days. I tried borrowing different amps (I have RebelAmp) it happens on all of them (Audio gd master 9, topping a90, AAA789), but it doesn't happen on the other headphones (Sennheiser hd800, Harmonicdyne G200) just elears. Switching to slow filter, completely fixes the issue and it makes imaging a bit more focused and 3d like, it also sounds just a small touch warmer, and the issue doesn't happen on files that have sampling rate of 88.2khz or higher no matter the filter settings.
So can someone explain what's going on?