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Second Skin Audio

2 FI SP4 18s box and tuning


Kyle13130

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So im trying to save as much space as possible, want to be able to see as much as possible out of my rear window.

The box that's preferable for me comes out as:

11.8 cubes net, 33hz tuning, 13.5 port area per cube (160 total), 1:4.42 port ratio

running on 5kw

I see some people say that these subs like big boxes, some say normal, seen someone say they sound good even in small boxes. You can never really know from reading forum post to forum post. Anyone with any knowledge of the sp4s or Fi woofers help would be really appreciated

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Smaller ported boxes have less output around the tuning frequency. Just understand that’s what you are giving up by having a box on the smaller side.  As long as your box size is still reasonable (and yours is) the system should sound bad. I think your proposed box specs should be fine. 

"Nothing prevents people from knowing the truth more than the belief they already know it."
"Making bass is easy, making music is the hard part."

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