First post, hello everyone.   My current setup is an Asus Xonar DS sound card - Yamaha AX-396 stereo amp - Denon D2000's   I've searched and found mixed views when comparing a headphone amp with using headphone out on a stereo amp.   Would i notice a difference if i replaced my old Yamaha amp with a headphone amp like the Little Dot Mkiii or Fiio E9?   I've also looked at the at the E7 / E9 combo if the Xonar DS DAC is not good enough.   Budget is...