I have a DX50 and a pair of HD598's. I've been somewhat disappointed with the sound but recently I ran it through my 17 year old Audiolab 8000A and suddenly everything makes sense! The 598's are really singing now!
The sound is so much more fuller and really gives the phones the oomph they need. I particularly like the deep sub bass, and the tightness and control across the instruments and the lovely sense of space and timing. It really has the Wow factor for me. But of course an 8000A is hardly portable!
So how much would I need to spend in order to get a comparable sound? Can anyone recommend a particular amp that they would consider to be similar in sound to the Audiolab or have ideas what amp would give the sound I am looking for?