DylanBunch Posted June 22, 2013 Report Posted June 22, 2013 What's a good amount of port area for 2 15s? Or is there a rule to go by? 2006 Ford Explorer 2 Team AA/Sundown 15s 6th order Ct Sounds 7k 4 PRV Mr500 8s Rockford p1000-2 Team Subsonic Lows
Krakin Posted June 22, 2013 Report Posted June 22, 2013 It's all generally 14-18 in2/ft I like boxes around 16. But generally with more xmax you tend to go higher to avoid port noise, but the higher you go the less bandwidth you have on notes. A lot of it is just building and testing in your car. 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.
DylanBunch Posted June 22, 2013 Author Report Posted June 22, 2013 No, port area not port per foot haha 2006 Ford Explorer 2 Team AA/Sundown 15s 6th order Ct Sounds 7k 4 PRV Mr500 8s Rockford p1000-2 Team Subsonic Lows
Krakin Posted June 22, 2013 Report Posted June 22, 2013 It's a relative thing. If you box is 4 cubes with 16 in2/ft you have a port that is 64 in2 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.
Krakin Posted June 22, 2013 Report Posted June 22, 2013 Port area has a lot more effect in 4th orders than in ported. In ported try to aim for the squarest port you can to minimize port surface area. Ex: a 8x8 port instead of a 3.75x17 port. getting the height to a 1:1 ratio will allow for a more efficient port. The only way to achieve a port with a ratio below 1:1 is to go with aeros. 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.
DylanBunch Posted June 22, 2013 Author Report Posted June 22, 2013 Ohhhhh makes sense. So cone area doesn't matter when it comes to port area, just the size of the box the sub (s) need? 2006 Ford Explorer 2 Team AA/Sundown 15s 6th order Ct Sounds 7k 4 PRV Mr500 8s Rockford p1000-2 Team Subsonic Lows
Krakin Posted June 22, 2013 Report Posted June 22, 2013 It does a bit. It kind of goes along the lines of cone area and x-max. But it doesn't really effect it much (from what I've read) on port area. Just make it big enough to not choke the air flow. If anyone can explain it better or if I'm wrong correct me. 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.
bkolfo4 Posted June 23, 2013 Report Posted June 23, 2013 I just cut my last two fingers off on my left hand. Another subject that get jacked up every time it gets posted. A couple of quick highlights: Port area is NOT based on box volume. It is based on driver Sd and Xmax along with tuning frequency. The same driver in 4 cuft or 6 cuft needs the same amount of port area. A driver with high Xmax needs more port area in 4 cuft than a driver with low Xmax in 4 cuft. "Bandwidth" is NOT based on port size (this statement is crazy if you know anything about how a port works). Only way the port area would affect bandwidth is if the port is small enough that it does not operate correctly. Current system: 1997 Blazer - (4) Customer Fi NEO subs with (8) American Bass Elite 2800.1s Previous systems: 2000 Suburban - (4) BTL 15's and (4) IA 40.1's = 157.7 dB at 37 Hz. 1992 Astro Van - (6) BTL 15's and (6) IA 40.1's = 159.7 dB at 43 Hz.
Krakin Posted June 23, 2013 Report Posted June 23, 2013 "Bandwidth" is NOT based on port size (this statement is crazy if you know anything about how a port works). Only way the port area would affect bandwidth is if the port is small enough that it does not operate correctly. Always learnin. If possible could you go into further detail? On port area as a whole. 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.
ROLEXrifleman Posted June 23, 2013 Report Posted June 23, 2013 A couple of quick highlights: Port area is NOT based on box volume. It is based on driver Sd and Xmax along with tuning frequency. The same driver in 4 cuft or 6 cuft needs the same amount of port area. A driver with high Xmax needs more port area in 4 cuft than a driver with low Xmax in 4 cuft. Can you elaborate on this for us who would like more info. thanks Rolex you sicken me. Just let me finish my pie ~ Juice
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