Thanks for all those who replied. I perhaps should say that I have no doubt that cables can make a difference to an audio system. I am in the audio hobby more than 30 years and I have had my share of experimentation. The first time I witnesses a marked improvement in sound was many years ago (20?) when I connected XLO 5.1 to my quads 57. It was as if I suddenly changed into an amplifier 10 times more expensive than what I had. So I am not very much convinced by all those who say cables don't make a difference, although I'm sure it also depends on which cables you use.
Right now I have both the Quads in one system and the La Scalas (with Crites tweeters) in another, using DIY speakers cable on the latter. But I believe I can do better than that. About the MIT, I know about their interface boxes, which are some kind of impedance matching network between the amp/cable and the speakers. The idea being, I believe, is that cables have differential impedance characteristics with respect to the signal's frequency range, and that the network is supposed to compensate for that (like a kind of equalizer, albeit with properties like capacitance, inductance etc.). This sounds logical to me to an extent but I can appreciate the point of view which says that this introduces a further stage into the signal's pass and that 'simpler is better'. (Not in my experience, though: I, for example, detest passive pre-amplifiers).
Anyhow, I did have occasion to hear a few expensive MIT cables at a dealer's place, and I always found the sound to be very relaxing, wide, and detailed, characteristics which the Klipsch, I believe, might benefit from. But it is true that they (MIT cables) were mostly used in SS systems (Krell, Madrigal), with big speakers. Hence my question. But perhaps the fact that very few people do try them in Klipsch shows something too. Thanks.