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Hi,

So with some help from the forum (thanks tons guys) I have spec'd out my sub and box. I need a subsonic filter at 18hz. The prob is my amp does not have a subsonic filter : / well, not an adjustable one anyway.

Question is where do I find what I need? I've searched but can't find one that goes that low. Maybe, I'm searching for the wrong thing. Can someone help me out here?

Thanks
 

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Then you won't be needing the Reckhorn B1. The Bash 500 from Parts Express has a factory set subsonic filter at 30 hz which is too high for your needs. It can be modified by changing 2 resistors. Change R17 to 20k ohms and R18 to 75k ohms and you'll get 1 db of boost at 25-30 Hz and a SSF at 18.7 hz, which is close enough for what you need.

http://www.partsexpress.com/pdf/300-752.pdf
 
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