wafsman Posted June 14, 2011 Author Report Share Posted June 14, 2011 So in order to get the port area and the port length I need, the port will have to be pretty long, so I was wondering if when doing a slotted port you can double back the ports to get the required length? Pic included to show what I mean by double back. Quote Link to comment Share on other sites More sharing options...
PandorasCustoms Posted June 14, 2011 Report Share Posted June 14, 2011 You can make as many bends in a port as you wish, but you have to make sure the port size is not affected. The ports in my box actually have... Four bends each. Bending a port could save a lot of Enclosure volume if you do it right. Quote Chris - "The Apprentice" - Pandora's Box Customs 1994 Ford Explorer - "Midnight" - 4.0L SOHC SoundStream PCX-1000D & Kicker S12L5 Link to comment Share on other sites More sharing options...
PandorasCustoms Posted June 14, 2011 Report Share Posted June 14, 2011 JL has a great write-up about this... ------------------------------------------JL Audio - Car Audio Systems http://bit.ly/kD7o2l ------------------------------------------ Slot / Ducts Ducts are often used when a particular alignment calls for an outrageously long port to be squeezed in a very tiny enclosure due to a very low tuning. This scenario is commonly encountered when constructing ported enclosures for long excursion drivers. Designing and implementing a duct in your own project is really not as hard as it may seem at first, but there are a few guidelines you must follow if you are to experience any degree of success utilizing this porting technique. Below is a perspective view of a typical duct port along with a few helpful tips on how to get the best results from your duct. Quote Chris - "The Apprentice" - Pandora's Box Customs 1994 Ford Explorer - "Midnight" - 4.0L SOHC SoundStream PCX-1000D & Kicker S12L5 Link to comment Share on other sites More sharing options...
wafsman Posted June 14, 2011 Author Report Share Posted June 14, 2011 Awesome, thanks for all the help. That gives me a lot of ideas so, I'll post up in a little bit what I came up with. Thanks again. Quote Link to comment Share on other sites More sharing options...
wafsman Posted June 14, 2011 Author Report Share Posted June 14, 2011 (edited) Ok peoples, this is what I came up with. The box is 36 wide, 24 deep and 15 tall. The port is 2.5" wide and 13.5" tall, giving me 33.75 sq in of port area per sub. Each sub will have 1.87 cu ft after speaker and port displacement. The port is 38.625" long bringing the frequency of the box to about 33.45 Hz. All math was checked against the equation found on the JL site provided, along with following the guidelines JL has for ported enclosures. Thanks again for all your help and let me know what you all think. Edited June 14, 2011 by wafsman Quote Link to comment Share on other sites More sharing options...
PandorasCustoms Posted June 15, 2011 Report Share Posted June 15, 2011 (edited) That looks like a good setup to me. Similar to a build I made before. It is just unfortunate you will be losing so much Enclosure volume from port displacement, but its all good. You should not have any problems with port noise with monsters that size... By the way, just for future reference as well, the Rule of thumb is a maximum of 8:1 for Height:Width on a rectangular port. You met this easily, but just wanted to throw out some more data for any others watching and considering this thread... Edited June 15, 2011 by PandorasCustoms Quote Chris - "The Apprentice" - Pandora's Box Customs 1994 Ford Explorer - "Midnight" - 4.0L SOHC SoundStream PCX-1000D & Kicker S12L5 Link to comment Share on other sites More sharing options...
wafsman Posted June 15, 2011 Author Report Share Posted June 15, 2011 Thank you Pandora and everyone else for your assistance. Can't wait to start working on this bad boy. Quote Link to comment Share on other sites More sharing options...
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