Maybe liquid cooled? Ferrofluid is a standard liquid cooling for tweeters. It works, and is cheap enough that even white van speakers might actually use it. Your problem may the cheap circuit breaker, which can be replaced, or even bypassed. Probably not the greatest speakers in the history of the world, but you have them, and clearly you enjoy them enough to be annoyed when they don't work, rather than relieved (and believe me, some fancy speakers sound better not working), so see if there is an easy fix.