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Frequency Range Testing : 20hz to 70hz Thanks For Rating & Subscribing! www.youtube.com/EXOabigdeal Just to be sounding good & safe with my new tuning -20hz was the deepest tone I wanted to play for right now, and at that, I kept the volume to a modest level until slamming the higher tones. But seriously, it got crazy loud :) Getting these Soundstream Triple X 18's was the best idea ever. Now to get even louder! Pure addiction!