Kendall Weeks Posted April 30, 2014 Report Share Posted April 30, 2014 Hello fellow members of SMD forum. I do not know if this is the correct place to post my question but this is the enclosure section. I need some help with port area. How much port area should be used in a 4th order? Also do I tune the port to the resonant frequency of the sealed section given on WINISD or do I tune the port to the resonance frequency of the sealed box in the vehicle? I have also heard that the size of the port affects whether the box will play the low notes more than the tuning frequency. Is this true? Should I make the sealed section bigger than the manufacture recommendation to get the sealed resonance to like 43 hz for example to play low? If anyone could help it would be greatly appreciated. I would like if someone could go into great detail about these questions for me. I am eager to learn as much as I can and at 16 years old I am planning on building a b-pillar 4th order wall but want it to be right before I start building. Thanks again! Link to comment Share on other sites More sharing options...
SMF93 Posted April 30, 2014 Report Share Posted April 30, 2014 . Link to comment Share on other sites More sharing options...
Kendall Weeks Posted April 30, 2014 Author Report Share Posted April 30, 2014 Can anyone help me? Link to comment Share on other sites More sharing options...
Krakin Posted April 30, 2014 Report Share Posted April 30, 2014 You can mess around with this to find a close estimate of what you should be around for port area. Make sure you check off bandpass enclosure. http://www.carstereo.com/help/Articles.cfm?id=31 Krakin's Home Dipole Project http://www.stevemeadedesigns.com/board/topic/186153-krakins-dipole-project-new-reciever-in-rockford-science/#entry2772370 Krakin, are you some sort of mad scientist? I would have replied earlier, but I was measuring the output of my amp with a yardstick . . . What you hear is not the air pressure variation in itself but what has drawn your attention in the two streams of superimposed air pressure variations at your eardrums An acoustic event has dimensions of Time, Tone, Loudness and Space Everyone learns to render the 3-dimensional localization of sound based on the individual shape of their ears, thus no formula can achieve a definite effect for every listener. Link to comment Share on other sites More sharing options...
Kendall Weeks Posted May 1, 2014 Author Report Share Posted May 1, 2014 Can anyone help me a little more? Do I tune the ported chamber to the resonant frequency of the sealed section? If so do I need to make the sealed section larger to lower the resonant frequency to like 44 hz if thats what I were to tune the ported chamber? Link to comment Share on other sites More sharing options...
matt.b Posted May 1, 2014 Report Share Posted May 1, 2014 heres a thread explaining 4ths http://www.stevemeadedesigns.com/board/topic/126478-basics-of-a-4th-order-bandpass-enclosure/?hl=%204th%20%20order Link to comment Share on other sites More sharing options...
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