Can someone maybe ask the Russian programmer who is making the custom firmware if he knows exactly why the sound of the DX50 changes with each firmware version? Is it because they were using unvinished "daily builds" of the audio codecs, as many have speculated, or is there another reason?
If the daily build/audio codec theory turns out to be correct, my guess is that it's Rockchip tha'ts making the mistake. It would explain why Ibasso claim to know nothing about it.
Ques : It would be good to find a config responsible for the operation of the digital filter. With him ibasso achieved much different sound in their fw.
Doc2008 : No such firmware configs. Manufacturer makes changes to the application itself Mango player and library libParticleOmxFFmpegComponent.so