Fang, I would like you to develop something more simple: Why not an amp that had the same sound signature of the HM-601?
With the standard amplifier, I think the HM-801 is too bright with less bass, missing body and/or soul to their sound. Moreover, at least with my Shure SE530, there is a problem with sound tonality. I think it has a nasal sound
At first, I did not like the HM-801. I was expecting a similar sound signature to the HM-601, but even more space, depth, detail, etc..
I will not sell this unit, at least for now. I will give a chance to GAME amp and some other news that may arise for this player.
Cheers,
Peter