例えばこれを
https://i.imgur.com/uo1hcBC.png

スピーカーに出すとこうなって
https://i.imgur.com/XF8QM1j.png
https://i.imgur.com/zV81wGz.png
ヘッドホンに出すとこうなる
https://i.imgur.com/JNKfQUp.png
https://i.imgur.com/oabtxuc.png

https://forum.powerampapp.com/topic/9029-is-upsampling-a-good-idea/?do=findComment&;comment=36241