Just curious to know if they have a damping fluid. If so is it replacable. I opened one up to press the dome back into position where one of my kids had pushed in on it and found it to be dark, I assume they had been over driven at some point in their lifetime. Noticed at that point that they seemed to have fluid, let me know asap. The voice coils seem to be o.k. but there is no real way of telling how long they will last before I have to replace them.......I am not in the habit of overdriving my speakers so they may make for a while at least.