ROLEXrifleman Posted July 12, 2014 Report Share Posted July 12, 2014 single Zv4 on 2K of power Looking to move air Quote Rolex you sicken me. Just let me finish my pie ~ Juice Link to comment Share on other sites More sharing options...
Krakin Posted July 12, 2014 Report Share Posted July 12, 2014 (edited) Well, you got the low tune right, but what size sub is it? The port area looks low. Given a lower port area will increase the velocity, but I still don't feel conformable with it. Edit: you probably want at least one extra baffle and you need to account for sub displacement. Edited July 12, 2014 by Krakin Quote 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...
ROLEXrifleman Posted July 12, 2014 Author Report Share Posted July 12, 2014 15" zv4 when I called them today they said keep it at 14" per foot even when I said 15-16 they said 14 was best. I can add an inch here or there to make up the air space difference to account for an extra baffle and displacement Quote Rolex you sicken me. Just let me finish my pie ~ Juice Link to comment Share on other sites More sharing options...
Krakin Posted July 12, 2014 Report Share Posted July 12, 2014 Well, I'm not going try and bring down sundown or anything, because I do respect them a lot. However, I don't believe in the port per cube. I go the route of port velocity and determining how much air is being moved and keeping it going under a controllable velocity, which with modern subs equates to some very large port per cubes. This is a quick calculator to get you in the right direction. http://www.carstereo.com/help/Articles.cfm?id=31 This will lower air velocity, but you are still going to be moving a hell of a lot of air, especially if you tune low. Also, if there is someone reading this that knows a lot more about moving air than I, then speak up. I'm a SQ guy that knows a little about aerodynamics. Quote 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...
ROLEXrifleman Posted July 12, 2014 Author Report Share Posted July 12, 2014 WOW, that calculator say 109 square inches! Quote Rolex you sicken me. Just let me finish my pie ~ Juice Link to comment Share on other sites More sharing options...
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