I've been wondering that for YEARS Windforce lol..............
There are some other great music apps as well, but to me, Poweramp is the best sounding AND easiest to use. It also is one of the few apps that comes with a TEN-band EQ, which to me is vital.
Yeah which options you have enabled or disabled in Poweramp's Settings will definitely have an influence on the end sound. But even without, Poweramp just sounds better and louder than most others.
Yes that's possible that it uses more of the full potential of the sound hardware than the other apps do.
I definitely believe that using the EQ makes a vast difference. I myself have tried either leaving EQ off or using the "Rock" EQ preset, but having the EQ off (which is the same as using "Flat") makes the sound too weak IMO. The "Rock" preset is fine for listening in the car but on my headphones (Meze 99 Classics), I created a custom EQ based off the "Rock" preset, and that gave me an even more finely-tuned sound that better matched up with the sound signature of my 99 Cs. I detail that in
my review of the 99 Cs as well as include screenshots for anyone interested. I had a custom one as well for my old AKG K551s too that a friend on here helped create for me. I love Poweramp too cuz it lets you create the custom EQs and save them in a file that you can transfer to another phone in the future w/o having to recreate it.