As-21 Posted July 4, 2012 Report Share Posted July 4, 2012 Ive read some where that if subwoofer with Power Handling of 2000watts and i run it on 3400watt amp its a must to reduce the net volume of the enclosure and the port area. why is that ? how can i know if i over power it and how much volume i need to reduce ? Is there a article about the connection with how many watts and the volume and port area ? Quote Hertz HSK 165XL Celestra FA475xDC Audio 3.5KDC Audio level 5 12 inchXS Power 6500 on the front.XS Power 3100 on the back.Knukonceptz 0 gauge an 10 gauge OFC wire. Link to comment Share on other sites More sharing options...
t-money Posted July 4, 2012 Report Share Posted July 4, 2012 the port area is determined by the net volume of the box. so as the box shrinks the port area needs to do the same. the reason for making the box smaller to handle more power is the smaller box will create more "back pressure" on the sub. but you have to be careful when doing that Quote 2002 ford focus hatch pioneer DEH-P8400bh infinity kappa 6.5 components front and rear XS Power D1200 Shuriken BT-100 audioque 120.4 2 15 inch audioque HDC3 D2 2 audioque 2200d big 3 mechman 220a alt with external regulator 479-418-3056 Link to comment Share on other sites More sharing options...
As-21 Posted July 4, 2012 Author Report Share Posted July 4, 2012 (edited) So if i understand what you say we creating back pressure to cancel the over powering ? Is this a correct analogy: If crane can lift 20 pounds (equals to power handling of the sub) and i gave him extra 10 pound ability to his engine(amp) but didn't reinforced the metal or structure (sub motor cone ...) so i need a force (back pressure) to reduce it to 20 pounds so i wont fail. Edited July 4, 2012 by As-21 Quote Hertz HSK 165XL Celestra FA475xDC Audio 3.5KDC Audio level 5 12 inchXS Power 6500 on the front.XS Power 3100 on the back.Knukonceptz 0 gauge an 10 gauge OFC wire. Link to comment Share on other sites More sharing options...
t-money Posted July 4, 2012 Report Share Posted July 4, 2012 yea something like that Quote 2002 ford focus hatch pioneer DEH-P8400bh infinity kappa 6.5 components front and rear XS Power D1200 Shuriken BT-100 audioque 120.4 2 15 inch audioque HDC3 D2 2 audioque 2200d big 3 mechman 220a alt with external regulator 479-418-3056 Link to comment Share on other sites More sharing options...
bkolfo4 Posted July 5, 2012 Report Share Posted July 5, 2012 the port area is determined by the net volume of the box. so as the box shrinks the port area needs to do the same. No, No, No!!! The box can shrink to help the mechanical power handling, but the port area does not have to. One more time - port area is not dependent on box volume. . . 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...
john253a Posted July 5, 2012 Report Share Posted July 5, 2012 (edited) People need to get out of the 13-16sq" of port per ft idea It just a rule of thumb The port area has more to do with cone area, Xmas and power then net volume of box A 12" sub with 15mm Xmas does not nees the same size port area as a 12" sub with 50mm Xmas, because they both recomend 1.5-2cuft net Post what sub you have and what amp and wiring configuration your planing on running, And some diamenshions for where it's going Big3, alt upgrade, and what ever else you have, And well try to help you out Edited July 5, 2012 by john253a Quote Link to comment Share on other sites More sharing options...
bkolfo4 Posted July 5, 2012 Report Share Posted July 5, 2012 I'll take it a step further and say that technically power does not matter. A sub might reach 20mm of excursion on 1000 watts in one design and 20mm of excursion on only 500 watts in another design. You really have to just account for full excursion, unless you are really trying to minimize port area. At that point I would model the design with the max input power and see what the max excursion would be. 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...
As-21 Posted July 5, 2012 Author Report Share Posted July 5, 2012 (edited) People need to get out of the 13-16sq" of port per ft idea It just a rule of thumb The port area has more to do with cone area, Xmas and power then net volume of box A 12" sub with 15mm Xmas does not nees the same size port area as a 12" sub with 50mm Xmas, because they both recomend 1.5-2cuft net Post what sub you have and what amp and wiring configuration your planing on running, And some diamenshions for where it's going Big3, alt upgrade, and what ever else you have, And well try to help you out I asked this because i am hearing this for a while so i wanted to know why is that and how u can know what port and box volume to design for each configuration. This is what i want to put in my car and got waiting for level 5 to come out and mono to arrive : Hertz HSK165XL Celestra 475x (if you don't know this amp here is the specs: http://www.celestra....hede/FA475x.pdf ) DC Audio Level 5 DC Audio 3.5K 120AMP stock alternator (High output alternator kinda hard to find for my car i live aboard US and the car maker inst on the US + don't got the money for it for now) Big 3 with 0 gauge 1 run from the front to back of 0 gauge KnuKonceptz Kolossus Fleks Kable 1/0 From amp to sub KnuKonceptz Karma SS 8 Gauge Speaker Wire Xs power 5100 on the engine bay Xs power 3100 on the back this is my max sizes for the box: Height: 21 inch Width: 35 inch Depth: 18 inch Edited July 5, 2012 by As-21 Quote Hertz HSK 165XL Celestra FA475xDC Audio 3.5KDC Audio level 5 12 inchXS Power 6500 on the front.XS Power 3100 on the back.Knukonceptz 0 gauge an 10 gauge OFC wire. Link to comment Share on other sites More sharing options...
john253a Posted July 5, 2012 Report Share Posted July 5, 2012 your got around 4net @ 31hz to work with so without knowing the sub your using there isnt much more i can do, a assume its a dcl5 18, but if it a 15" you have more then enough space for it Quote Link to comment Share on other sites More sharing options...
As-21 Posted July 6, 2012 Author Report Share Posted July 6, 2012 your got around 4net @ 31hz to work with so without knowing the sub your using there isnt much more i can do, a assume its a dcl5 18, but if it a 15" you have more then enough space for it im going on 12 inch for now hopefully to add in the future a second sub and mono. Quote Hertz HSK 165XL Celestra FA475xDC Audio 3.5KDC Audio level 5 12 inchXS Power 6500 on the front.XS Power 3100 on the back.Knukonceptz 0 gauge an 10 gauge OFC wire. Link to comment Share on other sites More sharing options...
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