fecupe2001 Posted May 6, 2010 Report Share Posted May 6, 2010 Well, i´m not gonna say you are wrong because you know your shit of course, but, 6 c/f with 2 6" ports for a 18" sub for example wouldn´t sound the same on a 10 c/f with same 2 6" ports because you would have more port noise and surely less output, that´s just an example of course, but well, once again you know your thing, just by reading your numbers and stuff on your sign it´s easy to figure it out Quote I´m the SPL Gains topic creator!! wanna get louder?? check this: SPL Gains. Panamenian 2009 & 2010 & 2014 Bass Race 149.9 Champion! 2 15" subs and a 2K wired at 1 ohm, http://www.stevemeadedesigns.com/board/topic/167788-fecupe2001-2-15s-on-a-2k-video-on-page-3/ 8 Massive 15" subs and small power, http://www.stevemeadedesigns.com/board/topic/179296-fecupe2001s-8-15s-4th-order-bandpass-wall/ Link to comment Share on other sites More sharing options...
jarod027 Posted May 6, 2010 Author Report Share Posted May 6, 2010 But that is not correct. . .It does not depend on box size at all. Those are just approximations so people are not constantly asking how much port area they need, since the true mount of port area required for a port to operate correctly without compression is almost never achieved in a vehicle. If I have a BTL 18 on 4000 watts tuned to 35 Hz in 6 cuft vs 10 cuft, I do not need a different size port. If I have a BTL 18 on 2000 watts vs 4000 watts in the same 10 cuft, they do not require the same amount of port area. Port size is correctly determined by cone displacement and tuning frequency. . . So you think you can help me out with what I need? Quote Link to comment Share on other sites More sharing options...
bkolfo4 Posted May 7, 2010 Report Share Posted May 7, 2010 Well, i´m not gonna say you are wrong because you know your shit of course, but, 6 c/f with 2 6" ports for a 18" sub for example wouldn´t sound the same on a 10 c/f with same 2 6" ports because you would have more port noise and surely less output, that´s just an example of course, but well, once again you know your thing, just by reading your numbers and stuff on your sign it´s easy to figure it out So, I am always up for a good debate. . . What makes (2) 6" ports have more/less output and port noise in 2 different size boxes? Not overall efficency, just talking about the ports. And don't forget, the same port size with the same tuning will be shorter in the larger box. . . Quote 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. Link to comment Share on other sites More sharing options...
bkolfo4 Posted May 7, 2010 Report Share Posted May 7, 2010 So you think you can help me out with what I need? I would not do a single 4" with a square 12" sub, unless the port has a good flare or you are not running much power. As far as placement, I do ports on opposite sides and have never had a problem. There will be some who disagree. If one side is sealed off from the other side (like tight fit in a trunk), it may have a screwed up frequency response, but no worse than running the port of a standard ported box through the rear deck. If it is just a box in a trunk that the sound can pass around, should be ok. Quote 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. Link to comment Share on other sites More sharing options...
jarod027 Posted May 8, 2010 Author Report Share Posted May 8, 2010 I would not do a single 4" with a square 12" sub, unless the port has a good flare or you are not running much power. As far as placement, I do ports on opposite sides and have never had a problem. There will be some who disagree. If one side is sealed off from the other side (like tight fit in a trunk), it may have a screwed up frequency response, but no worse than running the port of a standard ported box through the rear deck. If it is just a box in a trunk that the sound can pass around, should be ok. How about two 4" aero ports? for two square subs, 1200watts Quote Link to comment Share on other sites More sharing options...
JeremyN Posted May 9, 2010 Report Share Posted May 9, 2010 Which would be volume, not area. . . we are looking at sq-in, not cu-in. ok maybe a noob question but why are people referring to area not volume for the port? the area is needed to lower noise but volume is needed for tuning? or maybe in wrong? Quote 2 12" Jeff Vue Customs 1 set MB Quart FSB 216 in doors1 American Bass 100.1 on sub1 Hertz EP2 on doorsJVC deck IPOD controlStock 105 amp alt DD-1big 3new build in Chevy caviler http://www.stevemead...chevy-cavalier/last set up in the ZX2 http://www.stevemead...-current-build/old build log http://www.stevemead...-1998-ford-zx2/ Gold is the money of kings, silver is the money of gentlemen, debt is the money of slaves. Just my .02c that shop needs keep those doors open so they have to charge for it if people think 10k is a lot then they should get into other hobbies.. like masturbating, cause any hobby cost money to maintain Lol no, I'm smarter than that bro haha. Fool me once, shame on you, fool me twice..............go fuck yourself lol Link to comment Share on other sites More sharing options...
bkolfo4 Posted May 9, 2010 Report Share Posted May 9, 2010 Box volume, port area, and tuning frequency are the choices. Port length/volume is set based on your 3 choices. Quote 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. Link to comment Share on other sites More sharing options...
JeremyN Posted May 9, 2010 Report Share Posted May 9, 2010 Box volume, port area, and tuning frequency are the choices. Port length/volume is set based on your 3 choices. like I said every body talks about port area not volume of the box or the port Quote 2 12" Jeff Vue Customs 1 set MB Quart FSB 216 in doors1 American Bass 100.1 on sub1 Hertz EP2 on doorsJVC deck IPOD controlStock 105 amp alt DD-1big 3new build in Chevy caviler http://www.stevemead...chevy-cavalier/last set up in the ZX2 http://www.stevemead...-current-build/old build log http://www.stevemead...-1998-ford-zx2/ Gold is the money of kings, silver is the money of gentlemen, debt is the money of slaves. Just my .02c that shop needs keep those doors open so they have to charge for it if people think 10k is a lot then they should get into other hobbies.. like masturbating, cause any hobby cost money to maintain Lol no, I'm smarter than that bro haha. Fool me once, shame on you, fool me twice..............go fuck yourself lol Link to comment Share on other sites More sharing options...
jarod027 Posted May 9, 2010 Author Report Share Posted May 9, 2010 and help on the two 4" aero port idea? Also, if I'm doing that, which has a 7inch opening, will the tuning be different than if I were tuning for a regular 4"? Quote Link to comment Share on other sites More sharing options...
jarod027 Posted May 11, 2010 Author Report Share Posted May 11, 2010 bump,any help for the port area needed for aeroports? Quote Link to comment Share on other sites More sharing options...
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