Hornloaded

Hello, I am very new to this community, starting just today. I am the original owner of a pair of 1981 Belle Klipsches. A while back I had occasion to email back and forth with a tech at Klipsch about whether my speakers needed anything to keep them sounding good. He recommended buying crossover kits. Since I am not the best with a soldering iron, I sort of dismissed the idea. However, in discussing the issue with a learned colleague, I am reconsidering the change. My speakers are in mint condition and they still sound great to me. However, if a crossover kit will help make them sound even better, I am for it and I will figure out how to get the updates installed. Can anyone tell me: Are the kits worth the money and time it takes to install them? What changes can I expect to hear in the sound with the new mods? How difficult are they to install? What is included in a kit? How expensive are the kits and where do I get them> Anything else I should know about the kits? I also have a pair of mint 1978 Heresys. Should I upgrade these in any way? These are used as the main front speakers in my basement home theater while the Belles are my "high end" system speakers. Thank you! Scott in Minneapolis