I use the port calc @psp-inc.com.When I goto play some test tones the box is supposed to be tuned @33hz but is loudest at around 40hz.I figured in all displacements.Box is 4.05 cuft after subs and ports,it is for 2 12s....2 4" ports at 12.6' in length.Pioneer TS-w303R subs.We are very happy with the output but I cant figure out why it is tuned higher than what I built it for.
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