so earlier today I received a pair of ps500. While I think they do sound very good, I find them just a bit too boomy for my taste. I did notice that the Grado highs and mids are still there, just a bit over shadowed by the boomy bass though.
I put on a pair of G-cush on them and while the sound improved quite a bit the bass was still a bit too much for me.
Holding up the cups up to the light I could see that there is four holes punched in the stock configuration so I decided to cover up two of them...
WARNING: NOT FOR THE FAINT OF HEART!...
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I was able to hear them side by side briefly next to the PS1000 before coming to work and I'm very pleased with the initial results. I thought they sounded VERY close to the PS1000, although not quite there. They still need the heavier cups to get even closer in sound...