double check it with a ohm meter- to see if it is blown or not(if it hisses it probably isn't, but better safe than sorry).
your using audiomulch to setup a active crossover right? assuming that is right, double check your connections in audio mulch, or try sending the same signal as the left tweeter to the right tweeter. if it still doesn't work, hook up the right side tweeter wire to the left side tweeter outputs of the amp. very simply, work backwards from the tweeter(it's fun, i know...) and verify the signal at every device.