Hi everyone, long term Poweramp user here.
I'm currently owning a LG V30 (Stock Pie) which is supposed to have a great quality audio output thanks to it's DAC, but I have a low hissing noise occuring during playback through the headphone jack. I suspected for a long time a hardware issue : all apps are subject to it (using default Android drivers or not), as well as all the headphones I tested, all files quality are subject to it (tested from crappy 128kbps MP3 to vinyl ripped in 96kHz/24bit FLAC), no "force hi res" mod works and nobody is complaining about a similar issue on the V30 threads and forums. Activating my internal Quad DAC (or DTS/Dolby/system equalizer/...) seem to increase the noise, but I'm not sure it's anything other than placebo at this point.
However, Poweramp HiRes output option literally nukes this noise. I assume there's nothing gain related, as I always compare at equivalent volume. A very (very) low noise can be heard but it's for very high volume level. When I activate DVC or chose any other output option, the noise is back. And the Quad DAC doesn't generate noise at all ! I can't use any external effects without having the noise back.
My question is : How does Poweramp HiRes driver works ? From my point of view, this situation is a complete nonsense, but I probably lack a lot of knowledge and would be glad to understand more about it.
Finally, is there way to mod my device so I can replicate the work of Poweramp HiRes driver ? I have root and I'm not fearing bootloops, and I really want to understand more about Android audio (and also enjoy good audio at low volume for every sources).