JacobPitts Posted December 21, 2019 Report Share Posted December 21, 2019 Can anyone tell me how much cu ft I need for 2 sundown x-12s on a sundown 4000d in a 4th order box. The sealed chamber is a single so both subs are in 1 chamber. The motor will be in the ported chamber. It will be a blow through with a 9x9 port that is 10.54” long (4.9” inside box , 4.9” outside box) Link to comment Share on other sites More sharing options...
CstrokerV Posted December 21, 2019 Report Share Posted December 21, 2019 That Port is way to small for a fourth and that much power my build http://www.stevemeadedesigns.com/board/topic/142505-small-build-log-4-dc-lvl3-10s-tl-update-link-to-rebuild/ http://www.stevemeadedesigns.com/board/topic/154258-rebuild-6-lvl3-12s-update-small-video-nothing-spectacular/ new build http://www.stevemeadedesigns.com/board/topic/188181-03-trailblazer-slow-build-8-dc-lvl3-12-m1-motor-m2-parts/ Link to comment Share on other sites More sharing options...
DiBo Posted December 21, 2019 Report Share Posted December 21, 2019 You're going to want about 110in²-125in² of port area. Tune it to around mid 40's but if it was me I'd find resonant frequency of the vehicle before you tune it. I'd do about 2ft³ sealed and whatever ratio you want after that. 1:1 for more of a flat response and larger ratios will start to get a little peaky soni wouldn't go more than 2.5:1 ratio personally. 2:1 is good. Link to comment Share on other sites More sharing options...
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