the situation im in is that i built a cabinet with a 15" driver and a horn, the horn is crossed over using a peavey crossover, i dont know any more about it than that, but, i have a popping and cracking noise coming from the horn. i would like to just replace the horn with a piezo or two even?? i have read they dont require crossovers, but my questions are: do they take crossovers? and how does a piezo horn figure into the ohm equation? if you add one, or two or 10 for that matter, do you figure the ohm rating for the cabinet the same way as you would a regular speaker? i have consulted google...i cant find a real answer, let me know what you think. thanks!!