Step 1 is hook them up and enjoy!
Key here is to know the sound, pro and con. This way, if you try something, you will know if it is an improvement or not.
Many times (depending on who has owned them prior), they will be just fine as they are.
One point is that year, 1983 there started to appear some transitional combinations of drivers as they moved toward the Heresy II. Some call them the 1.5!
If you open them up and check the components, you may find a K55M or K52H mid driver. If it is the 52 it probably has the E-2 crossover instead of the E. Additional changes were also made at later dates until the H2 was official. If you do open the cabinets, loosen and tighten all screws on the cross over. Very easy step, might help, why not?
Not going to debate which is better, both versions are very good.