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Im wondering what is the recommended frequency center is for subwoofers. where do yall set it at? there are 4 settings that are on my ppi pc21400 amp. 30Hz, 36Hz, 44Hz, and 60Hz. I have 2 kicker L7's and their frequency response is at 20Hz-100Hz. which of the 4 settings would sound best or be better for the sub. thanks

 
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depends on what type of music you listen to. i wouldn't go any lower than 60Hz.