Swapping drivers is the easy drop-in route. Ultimately however all that can do is add a bit of sparkle. The much harder but far more satisfying route is to upgrade some or all of the crossover components. As long as you are careful to use only same electrical value parts and only upgrade the parts quality this will have zero risk of fundamentally altering the character of the speaker but will elevate it tremendously with far greater dynamics, detail, and extension.
Ultimately however I am with sbayne on this one, the best upgrade money you can spend will be on a new pair of Moabs. Eric with his low stiction low mass approach has the currently best speaker design philosophy, but this only reaches full fruition with the full MTM array. That is what makes Moab the #1 bargain in high end speakers.
If you are interested in doing a full crossover upgrade please check out the pics on my system page, where you will find detailed images of exactly what it involves. https://systems.audiogon.com/systems/8367
Ultimately however I am with sbayne on this one, the best upgrade money you can spend will be on a new pair of Moabs. Eric with his low stiction low mass approach has the currently best speaker design philosophy, but this only reaches full fruition with the full MTM array. That is what makes Moab the #1 bargain in high end speakers.
If you are interested in doing a full crossover upgrade please check out the pics on my system page, where you will find detailed images of exactly what it involves. https://systems.audiogon.com/systems/8367