GOTTA share this immediately: after about 200 hours of burn in my 400is completely dazzled me out of a MOJO AUDIO NOS DAC into a David Berning MicroZotl tube headphone amp. the synchrony of the above chain is unreal, a completely different beast with the tube power and the state of the art NOS (non oversampling dac) I had played with the 4000is only DX90s with a Cayin C5 powering it, with an Audioquest Dragonfly with stabilized iFi power supply, etc. but nothing prepared me for how good these cans are with tubes and NOS dac. sound like my old Magnaplanar2.0 speakers on steroids. bass is great, mids are liquid and treble sparkly. i am so satisfied i can hardly speak. hi rez files sound the best of all, they are ALIVE on good recordings (like Linnrecords xmas gift files) and voices silky and seductive...but EDMs sound like being in a live club thats inside your head
not as much detail or soundstage as the 560s i heard on tour, but i like this sound way better, much more musically involving and emotionally stimulating. back to listening...