dexjam Posted April 24, 2013 Report Share Posted April 24, 2013 I'm interested in the SD2 D4's for a shallow mount build. I would like to know how you would find the vent length for the very small enclosure recommended by the Sundown website. When I calculate vent length, I'm getting really long vents in order to tune to frequencies even as high as 45hz. Even with small port area, I'm still getting vents that are much longer than what is practical. The website suggests using a 0.5 cubic foot enclosure if you are venting, and 0.25 cubic feet for sealed. The website does not; however, specify a tuning frequency or vent size or length. Any help would be greatly appreciated. Quote Link to comment Share on other sites More sharing options...
Bradprobert Posted April 26, 2013 Report Share Posted April 26, 2013 you will have to increase your box volume to end up with the net volume of 0.5 that will be after all displacements. the port is a displacement and if youre using torres, it will calculate it for you. even though its a shallow mount it will take up quite a bit of space in a ported box. for that sub and what it seems like you are trying to acheive in size, just do a sealed box. Quote [sharedmedia=garage:vehicles:2223] 4th-order under rear seat build log: http://www.stevemeadedesigns.com/board/topic/165708-4th-order-under-rear-seat-chevy-extended-cab/#entry2410477 SD, thank for the input. I would have replied earlier, but I was measuring the output of my amp with a yardstick . . . Link to comment Share on other sites More sharing options...
dexjam Posted May 3, 2013 Author Report Share Posted May 3, 2013 Thanks bradprobert. That was the conclusion that I came to also. I think I will do sealed. Quote Link to comment Share on other sites More sharing options...
the moose Posted May 4, 2013 Report Share Posted May 4, 2013 (edited) You could also try a sub box w/a wider face and mount your port tube on the outside of the enclosure using 3" plumbing pvc pipe with an elbow, thus retaining your internal box volume. Tuned ports work the same way, whether inside or outside of your enclosure Edited May 4, 2013 by the moose Quote 1974 VW Beetle 2- JL Audio 10w08 subs in ported fiberglass enclosure Hifonics ZRXLP 6.5C (fronts) Hifonics HRC 5.2C (rears) 500w Crunch powerzone amp (subs) 600w Crunch powerone amp (components) 3 farad power acoustics cap. head unit- Planet Audio P385UA Boss eq 1208 Link to comment Share on other sites More sharing options...
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