qcbangin Posted June 13, 2011 Report Share Posted June 13, 2011 if my subs call for 3 4inch ports per sub, and i want to just run either one or two large ports instead, what size large port would be equivelant? i was told that a 12inch sono-tube is too big. can anyone help? Quote Link to comment Share on other sites More sharing options...
nCOMP1337 Posted June 13, 2011 Report Share Posted June 13, 2011 I believe as long as the area of the port is equal, that is what you should be concerned with, so you would need to know the length and diameter of the smaller aero ports and then find the area by multiplying diameter by length and multiply by number of aero ports, then you would have to find 1-2 larger aero ports that is equal to or as close to equal to the area of the smaller ports Quote Link to comment Share on other sites More sharing options...
qcbangin Posted June 13, 2011 Author Report Share Posted June 13, 2011 so i just need to know the area of the 6 4inch ports to come up with one number, then get one or two larger ports from that number? I believe as long as the area of the port is equal, that is what you should be concerned with, so you would need to know the length and diameter of the smaller aero ports and then find the area by multiplying diameter by length and multiply by number of aero ports, then you would have to find 1-2 larger aero ports that is equal to or as close to equal to the area of the smaller ports Quote Link to comment Share on other sites More sharing options...
nCOMP1337 Posted June 13, 2011 Report Share Posted June 13, 2011 yea so say 1 4 inch port is 5 inches long, the area of that port would be 20 square inches, so say you have 6 of those, thats a combined total port area of 120 square inches so here as long as the combined total port area is 120 square inches, you should be fine so like 2 6 inch aeros at 10 inches long would net you 120 square inches of port this is at least how i see it, read my sig though i am a noob, it is best to allow someone else to chime in, but to me this is how the area would work and as long as the area is the same it should matter, though i do think less bigger ports are better than more smaller ports, so wanting 1 or 2 instead of 6 is a good choice Quote Link to comment Share on other sites More sharing options...
qcbangin Posted June 13, 2011 Author Report Share Posted June 13, 2011 i'm a newbie, too so i'll always take any advice and suggestions i can. this is all going in a trunk. it's crazy loud now, but it can never be too loud, which is why i want to go ported. i want to hit high 140's, but hopefully low 150's. i haven't metered it, but i could already be hitting it. Quote Link to comment Share on other sites More sharing options...
PandorasCustoms Posted June 13, 2011 Report Share Posted June 13, 2011 (edited) Might want to research this a little more. Is there any reason you are looking for a specific Port Volume? Tuning frequency is a combination of Port Volume, Number of Ports, and Enclosure Volume. According to the JL Audio site, they break it down like this... The correct way to figure out how long each port should be follows this simple three-step procedure: Divide the chamber volume by the number of ports you wish to use for that one chamber. Take the quotient and use that as your Vb (box volume) in the port formula Do the number crunching and figure out how long each port should be So, changing things up will have different effects on how the enclosure / speaker combination works. Are you just working off of a Manufacturer's Recommendation Sheet? If so, they are probably listing the port setup in a specific way in order to counter act Port Noise. Also, Going with a bigger port is never "worse". It just requires less length than a smaller port. Finally, remember if you are building your enclosure with the ports inside, exclude port displacement from the enclosure volume before calculating the tuning frequency. Edited June 13, 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...
bumonskateboard6 Posted June 13, 2011 Report Share Posted June 13, 2011 (edited) Doubtful in a sealed box in a trunk on that high 140-150...What equipment do you have? Use Torres calculator to calculate it all out or calculate it by hand with this: Av is the area of the port so (pi*r)^2 with a round port in inches squared Lv is the length of the port in inches Vb is the volume of the box in cubic inches Edited June 13, 2011 by bumonskateboard6 Quote Current Systems: 2011 BMW 335i Hertz HDP1 DC LVL3 12" Full Carbon Fiber 2002 Acura TlKenwood DNX9980HD2 DCLVL4 12" Subs with LVL5 Parts D.7 CoilsDC 3.5kHertz HSK-165 up front HCX-165 RearHertz HDP4 AmpDC Power Engineering 260 Amp AltBig 3 and amp powered with KNU 1/0XS Power D2400 Up Front i pulled out my dick in class many of times and had it shown. get over it bitch...stupid open legged hairy beavered bitch... going over rms = smaller box, under rms = bigger box... Low voltage doesn't blow amps. That's a myth. A router that does the sub holes makes rounded edges also? Link to comment Share on other sites More sharing options...
qcbangin Posted June 13, 2011 Author Report Share Posted June 13, 2011 (edited) i'd like to hit that, but i know it will be hard in a trunk. i will say it flexes all the doors, and shakes windows when i pull in the gas stations.probably say it's cheap, but can only get what i can afford; i'm running 2 power acoustik mofo 15's on a power acoustik BAMF5500.1D. big 3 upgrade with an optima red top in trunk. i didn't really understand the formula you gave me, and can't get the torres calculator on this slow computer Doubtful in a sealed box in a trunk on that high 140-150...What equipment do you have? Use Torres calculator to calculate it all out or calculate it by hand with this: Av is the area of the port so (pi*r)^2 with a round port in inches squared Lv is the length of the port in inches Vb is the volume of the box in cubic inches Edited June 13, 2011 by qcbangin Quote Link to comment Share on other sites More sharing options...
PandorasCustoms Posted June 13, 2011 Report Share Posted June 13, 2011 The formula was to assist in calculating tuning frequency. I have a spreadsheet that kind of does the same thing. The Torres Calculator doesn't take much as far as resources to run. You sure you can't get it? What are you running for an operating system? Anything XP or above should run it no problem. If you are running OSX or Linux, it might be another story. 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...
nCOMP1337 Posted June 13, 2011 Report Share Posted June 13, 2011 then can you give the dimensions of the box you have or plan to have, and what ports your wanting, and what subs will go in there and what power with the right info, someone on here can do the math for you and use torres to get the tuning your looking for Quote Link to comment Share on other sites More sharing options...
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