For what it does I have no complaints. It is a single purpose unit, so I rely on my DAC for headphone use. Other than that perhaps room acoustics play a part, but I doubt it considering I only swapped the amps and everything including tracks were all the same. Another thought is regarding power and what I have noticed with the LS50s is that they require good clean power to really shine (that and of course your need quality source material which is a crap shoot). oh and did I mention I have 54 year old hearing and spent my teens and early 20's going to many a live concert and for that I now hear nothing above 15 kHz. (according to my audiologist). Hence when I make a statement I try and qualify it with "the way I hear it"