I have the HARBETH 30.2XD’s which have the same drivers as the 40.x series.
do cables matter for peak performance? You betcha.
I experimented with numerous spectrum options and found that CARDAS CLEAR or CARDAS CLEAR REFLECTION operated as best of breed in my system
They bested the CHORD Odyssey, NORDOST FREY , VAN DEN HULL, and a bevy of other pretenders my system. .The CARDAS models smoked all the MOGAMI, CANARE, and BELDEN budget choices.