Well, at the risk of sounding wishy-washy,I'll say both. I can really only compare it to what it replaced ( McCormack dna225) which I thought was a great amp. The Sim has added a level of finer detail that I never noticed before,and it also seems to put more space between instruments. It does not do this at the expense of sounding forward,hyper,or fatiguing. I think it is very balanced, having excellent bass and treble extension,but I would not refer to it in either extreme ( warm vs hyper detailed). Does that make any sense?!