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Message: <blockquote data-quote="doox00" data-source="post: 5852249" data-attributes="member: 608758">I have an ID IDQ 12 D4 V.3 sub in a sealed box right now, I would like to build a ported one to try it out in.ID recommends a 1.9 cubic foot box tuned to 28hz with a 4" round port 13.80" long.The box I have room for can be no more than 35" wide and 16" tall, depth can be up to 14" or so. So if I have a box that was 22.5 x 14.5 x 10.5 (internal dimensions) that would give me 1.98 cubic foot box (sub has .05 displacement). What dimension/length would a square port have to be to be tuned to 28hz? The port would be 14.5" tall.thanks for any help** I was told you have to count the port as displacement as well so any help in designing would be appreciated.  thanks!</blockquote>

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