One of the engineers at ATC was an intern with us, when he left it was to go to California to work at ATC.
@ei001h If you get the active version, it has a balanced input that conforms to the balanced standard, AES48. A lot of high end audio balanced preamps don't actually support the standard; if they support the standard then the interconnect cable you use will matter far less or not at all (one of the benefits of balanced line if done properly). There are balanced tube preamps that have no problem at all with the 10KOhm input impedance.
The passive version of the speaker is an easy load. There are now class D amps out there that are every bit as musical (smooth and involving in the mids and highs) as the best tube amps or class A solid state amps so that might be something to put on the radar as well.