Wonderful, rich and full middle on the PS1K...I was surprised and delighted. I have owned the HD800 (2 of those), T1 and Audez'e, while the Audez'e is sounding superior to all listed prior (including the PS1K), the comfort was such I had to let the LCD-2 go. It's the middle and low treble integration that I find superior on the Grado, superior at least to both of those other dynamics, the 800 and T1. Using the PWT/PWD (modded) and Peak/Volcano it's quite good overall. AND, very comfortable...even with my large head.
The bass frequencies are are slightly prominent on the PS1K, and not a match for the Audez'e, who is clearly (and proudly) superior (with appropriate amp). I wish the build of the Grado was more substantial...I don't think it can outlast my antique HP-2's.