Could not recommend the PS1000 unless you somehow manage to audition them or find a seller who will
agree to 'try before you buy'.
They're unique headphones, I absolutely adore mine, the rest of my cans have been in deep hibernation
ever since I got my claws on them - they just sit there gathering dust. However, not all is red and rosy.
They're very material dependent, being a big sound stage can, the mids depending on the recording can
sound a little distant, it takes a long audition to realize the fine line that Johnny Grado walked whilst
creating these wondrous cans - if the recording was mic'd fairly far out then the PS1000 will certainly
make it sound even further out. However if the mic'd vocals eg, instruments are fairly forward sounding
then they can create this spectacular sound stage and keep the mids nice and forward.
In a nutshell, with some recordings they will blow you away big time and with others they can sound
a little lack lustre. Relatively easy to amp but you'd want choose carefully here, pick an amp that has
a tendency to sound a little forward. Good choices would be Woo WA6, Ray Samuels Raptor and
even the Schiit Lyr - I use Violectric and it's a fairly good match but there is better out there for
the PS1000 according to my taste.
As for the HE-500 - yet to hear it.