This question is prompted by the fact that I have a set of PA speakers that have horns but do not have an adjustable crossover. So then the question is this do high frequencies that a crossover sends to a low frequency speaker add any audio support to the low frequencies of that speaker? Or, is the end result essentially the same as if an equalizer was used instead of a crossover? If that is true, it seems that higher frequencies that a crossover sends to a speaker that is designed to produce low frequencies will be lost since that speaker is not designed to reproduce them. A crossover does not diminish the signal but just varies the point at which frequencies are distributed to the speakers. I also believe that a high frequency that is padded down to the maximum by the adjustment device in an equalizer is sent to the speaker at a level that is reduced to the point where it essentially no longer exists. And a crossover varies the frequency point at which the audio signal will be sent to one of two or more speakers. If I understand correctly an equalizer either rolls off or amps up the given frequencies that appear on its adjustment devices. I have a question about the difference between a crossover and an equalizer, and the final product of each.