cubs_fan0718 Posted February 26, 2014 Report Share Posted February 26, 2014 As the title states what would be the optimal port area for 1 Team Fi 15? I was thinking between 14-16 but im not really sure. If it matters mostly for daily but I will be competing with it also. 06 Impala SSKenwood Excelon DDX593 Ampere Audio 150.4 Ampere Audio 5K1 XS D4700 (front)Mechman 320a Alt. w/ Big 3 Lots of Second Skin Damplifier Under Construction for 2017 Link to comment Share on other sites More sharing options...
Pro7 Posted February 26, 2014 Report Share Posted February 26, 2014 You shouldnt go with the # of in^2 per cube, that is more of a rule of thumb and with that nice of a sub I'd wait to figure out an ideal box design. Not just a rule of thumb. Hopefully someone can come in and comment on how many in^2 of port is recommended for that particular sub. I'd guess about the same as an sp4 so around 60in^2 but maybe blfok4* can chime in since he seems to have a lot of knowledge about fi/aa subs and box design. I've gotten a blowjob and picked up my iphone behind her back to see what email notification I got from smd before Link to comment Share on other sites More sharing options...
Kyblack76 Posted February 26, 2014 Report Share Posted February 26, 2014 Yeah.. id ask Brian... for sure. My sp4's are no where near that. But, im not loud either. SMD SUPER SELLER The Burban Build Blazer Build sold Acura trunk build sold Link to comment Share on other sites More sharing options...
Kyblack76 Posted February 26, 2014 Report Share Posted February 26, 2014 Nick said, "like any other of our drivers, 12-16 per cube" Thats what i got... SMD SUPER SELLER The Burban Build Blazer Build sold Acura trunk build sold Link to comment Share on other sites More sharing options...
Krakin Posted February 26, 2014 Report Share Posted February 26, 2014 Port area should be based off of the driver(s) in use, tuned frequency, and the xmax of said drivers. At certain area's you can only the air moving up to a certain velocity before it starts to negatively affect your output, driver, and response. Once you go over said maximum velocity you encounter those problems. This is called port compression. After you start getting close enough to the amount of area you need flares become a good factor to work with as well, port flares allow a controlled change in velocity as air exits a port. This can prevent turbulence in the boundary layer, close to the port wall, from becoming audible. As the airspeed is lifted a little further, turbulence within the straight section of the port becomes an issue. Let's use this graph as an example, it shows how with a higher diameter you get a higher usable port velocity and then shows how different flare radii affect it as well. The red numbers just mean that you can't get any higher velocity from that diameter no matter how much larger you make the flare radius. As for how much port area for a single 15" Team Fi, you can't get a recommendation until you decide a frequency to be tuned at. 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...
cubs_fan0718 Posted February 26, 2014 Author Report Share Posted February 26, 2014 Im shooting for a 32hz frequency. 06 Impala SSKenwood Excelon DDX593 Ampere Audio 150.4 Ampere Audio 5K1 XS D4700 (front)Mechman 320a Alt. w/ Big 3 Lots of Second Skin Damplifier Under Construction for 2017 Link to comment Share on other sites More sharing options...
Krakin Posted February 26, 2014 Report Share Posted February 26, 2014 A good quick calculator that gets pretty much as close as needed is here: http://www.carstereo.com/help/Articles.cfm?id=31 But if you prefer doing the math yourself you can get them here: http://www.carstereo.com/help/Articles.cfm?id=21 http://www.diysubwoofers.org/misc/portcal.htm Doing port calculation with this "simple" equations can only get you within +10% of the minimum port area with a well rounded flare. The only way that is sensible to figure out the absolute best is to do testing with multiple enclosures. And of course you can get much much more complicated, but it is not really necessary for the average person building/designing enclosures. 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...
cubs_fan0718 Posted February 26, 2014 Author Report Share Posted February 26, 2014 thanks, I will check into those sites you have suggested. 06 Impala SSKenwood Excelon DDX593 Ampere Audio 150.4 Ampere Audio 5K1 XS D4700 (front)Mechman 320a Alt. w/ Big 3 Lots of Second Skin Damplifier Under Construction for 2017 Link to comment Share on other sites More sharing options...
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