The Empress sonic signature is transparent, laid-back, dynamic, with smooth highs.
I first inquired about the EX cables, but then spoke to Grover directly and he asked me what type of music I would be listening to. I told him 90% classical and he recommended Empress because their sonics were very open with no brightness. I feel that I'm hearing the true sound of the music, where the Purist adds some warmth.
I would imagine that the speaker cables have similar sonics.