SI Guy Posted June 30, 2009 Report Share Posted June 30, 2009 It's trial and error. I got a Civic SI hatch with subs up port up tuned to 40 hz. Two DC level 4 10's, and hit 144.3 on a tone and 142.0 on music. But I'm gonna rebuild and try for more. Tuning higher can give a little more SPL in a small hatch but won't usually sound as good on music. Quote Link to comment Share on other sites More sharing options...
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