LM4562 has bright warmer sound, harsh in the high and lack of bass.
while LME49720HA has a serious vocal laid back compare to LME49720NA which has slightly laid back on vocal only.
49720 is better for movie because of its better 2D sound but it is worse for certain music because of its unnatural high and sound fake for some instruments.
I prefer 3 opa2111kp in the xonar although it has some mixed up above the middle-high.
Some of the opamp cannot pair with LM4562, it will filter out the bass. I'm not sure whether because of its own LM4562 low bass characteristic or different soundstage between I/V and buffer opamp.
Edited by cent - 8/5/10 at 9:10pm