I to have a pair of Model X’s and the Interconnects are the most important (and only) wires that you can easily change. While it breaks with convention, I lengthened the wires from the amps to the speakers and used better IC’s from my preamp to the amps. 1 meter IC’s are a heck of a lot less expensive than 3-5 meter ones. Anyway, my amps are now sitting on my equipment rack, where they get a lot more air and I can isolate them more from vibration. I never understood putting tubes inside a speaker.
All The best.
JD