Abstract7's comments to first check with your speaker manufacturer is excellent advise. A number of years ago I totally rewired my Snell speakers, using the best Audioquest wire available. I was certain that I would get a terrific improvement, replacing the poor quality and puny wiring supplied by the factory. What in fact resulted was the most terrible tonal balance and phase shift you can imagine. I wound up returning the speakers to the factory. I expected that they would remove my wire, but instead, measured the speakers, factored in the changes, and swapped some parts in the crossover. After my speakers were returned, (with a substantial invoice), I was so mad at myself, that the improvements were a disappointment. The moral? If you change, be sure the factory says it will not alter the speakers electrical function in a negative way. By the way, my results have been just the opposite when applied to preamps and amps. I have rewired (replaced stock wire) in about a dozen units, and have always been rewarded with stunning improvements in sound, across the board. Best to you!
Internal Speaker Wiring ??
I just had occasion to pull a driver from my Thiel 7's and was quite surprised to see what looked like a rather "wimpy" wire connecting the driver to the crossover. It made me wonder if the "weakest link" theory applied to internal speaker wiring. In other words, am I foolish to spend hundreds of dollars on amp wiring and speaker cable when there may only be garden variety wiring inside the speaker ??