AVS Special Member
Join Date: Dec 2007
Location: Southern California
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If they have 5-inch drivers, they certainly can put out down to 80 Hz.
Setting the crossover any higher means you have only mono sound from the sub at the midrange frequencies, which ruins the sound. That does not make any sense.
Stick with 80 Hz, and make sure the filter on the sub is also set to 80 so it does not operate any higher than that.