Karmakuma, I will personally choose AMR DP777 over NAD M51. To me the NAD makes more Hi-Fi sense, the AMR makes more musical sense.
More specifically, if you love big bass the NAD will do better. But the AMR's naturalness and delicacy in midrange is really something special.
Any saying like "sleeper", "world beater", "everything" is just misleading. Nothing is the best and it all depends on your priority. It's easy to buy HiFi-ish DAC for around $1~2K, but very hard to buy musically involving DAC even if you spend $10~20K. The AMR is not a perfect DAC, but at least in a few aspects it enters the cost-no-object category.
More specifically, if you love big bass the NAD will do better. But the AMR's naturalness and delicacy in midrange is really something special.
Any saying like "sleeper", "world beater", "everything" is just misleading. Nothing is the best and it all depends on your priority. It's easy to buy HiFi-ish DAC for around $1~2K, but very hard to buy musically involving DAC even if you spend $10~20K. The AMR is not a perfect DAC, but at least in a few aspects it enters the cost-no-object category.