Hi, gabri313
You are changing the EQ when playing music in X3II but the sound without change, right?
If the sampling rate of the songs is higher than 48kHz, we have set the equalizer to invalid since EQ adjustment for high sampling rate songs would sometimes cause system delay.
I'm changing the EQ while playing regular FLAC and mp3: I can actually tell there are differences while playing mp3 but FLAC not at all.