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Hi - I have two ported subs (Dayton RSS 315hf-4) running with correction with BFD and REW. I need a subsonic filter, the crown amp I am using (xli 1500) does not have crossovers or EQ. I need a subsonic filter at around 17hz to prevent overexcursion of driver? What other options for an inexpensive in line subsonic filter?
 

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There are rumors on the web that the newer Crown XLS amps have a built 20Hz HPF. Not sure if that applies to your XLi, but it could? You might do some research and/or contact Crown directly to confirm before you worry about adding an external filter.
 

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Thanks Russ, I will look into that. These new subs I build rock, (5 cubic feet, tuned to 21 hz. ) but I don't want them to bottom out like my old sub used to with home theater use. So far so good with movies like Pacific Rim, but I also use for music at least 50%.
 
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