watchitsjosh Posted February 26, 2016 Report Share Posted February 26, 2016 So I purchased two of the sundown x-15 d4's and I'm looking for a box design with the subs facing up. I have a 2000 Escalade so real estate isn't a problem. I know one sub is calling for 4.25 cf so should i double that for two of them? If someone has a link to a setup with all the measurements already made up that would be awesome, but I just want these subs to pound so any help is appreciated. Quote Link to comment Share on other sites More sharing options...
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