Hi Branimir,
I have the W/P8 at home for the last 3 month. Before I bought them, I was afraid from brightness, strident upper midrange and aggressiveness, but I proved false.
With an Audio Research Reference 3+ Reference 110 amplification, the sound is on the warm side. I measured my room/speakers with a DEQX 2.6. The room correction decrease only in the 70- 100Hz range (my W/P8's stand "11 from the back wall), and didn't change anything else. The measurement show a flat FR graph with a small drop from 5K- 20KHz.