Heh, the Klipsch and the ESL extremes, meet at the point of trying to match with a Sub....A very hard match to make. The panels being very detailed (fast?) with low distortion, the subwoofers not so much.
I ran into the same issue trying to match sub's to my La Scalas, which offered much of the same strengths but added the ability
to go really loud. Ended up with 2 7' tall HSU subs and big amp power.