To "pop" fuses, you would have to have been driving the amplifier past the point of operation that it was comfortable playing in. As such, the amp was probably clipping ( heavy distortion ) and that is what blew the tweeter.
While it might not have sounded like "heavy distortion" at the time, the increased high frequency content and associated power output is what did the tweeter in. As such, it is possible that you have sustained either crossover damage ( blown capacitor ) or the tweeter has what is called an open voice coil. In most situations, it is the tweeter that does "give up the ghost". I would contact the manufacturer of your speakers and see what they suggest.
Something else to think about is your amplification situation. If you continue to do this, not only will you have speaker problems, you'll also have amplifier problems due to the amount of strain that you are placing on it. You either need more efficient speakers, a more powerful amplifier or reduced listening levels. Either way, you aren't in a "good" situation and it needs to be examined before things get both frustrating and expensive. Sean
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