n8ball2013 Posted November 10, 2010 Report Share Posted November 10, 2010 so you bump it every half hour expecting an answer? be patient. Doesnt kicker recommend tuning to like 42hz too? Quote THERE IS NO BUILD LOG! 1998 Chevy Silverado ext cab Alpine CDA-9887 4 Team Fi 15s 2 Ampere Audio TFE 8.0 2 Ampere Audio 150.4 3 Digital Designs CS6.5 component sets Dual Mechman 370XP Elite alternators inbound! 8 XS Power d3400 6 XS power d680 Second Skin Stinger Tsunami Wiring Sky High A Real Voltmeter not a piece of shit stinger. Link to comment Share on other sites More sharing options...
CJ18 Posted November 10, 2010 Report Share Posted November 10, 2010 I think the more port you can fit the better. I personally like 15-18 in2 of port area per ft3. You want to figure your port area and tuning based on you net volume, which is the volume after all displacements. Quote Link to comment Share on other sites More sharing options...
Black Viper Posted November 10, 2010 Report Share Posted November 10, 2010 I like going by the XMAX. I have 14^2 of flared aero port per cube for my 12 and it loves it. Used the crappy rule of 7-9 per cube for aeros and it lost a shitload of sound and had so much damn port noise I didn't want to listen to it. This will get you a ballpark answer http://www.carstereo.com/help/Articles.cfm?id=31 But you can find the actual equations on diysubwoofers.org I am wanting to properly vent a Alpine Type R1242D, and the data sheet gives you all the info you need for create it. Are the specs provided any good, if I am trying to vent it for both SQ and mid SPL? Have I selected a crappy sub to do perform this task? Quote Link to comment Share on other sites More sharing options...
EricR Posted November 10, 2010 Report Share Posted November 10, 2010 Larger ports are generally louder but more peaky, smaller ports are able to play a larger bandwidth. If you have 14 cuft I would suggest no less than 170 sqin of port. Quote i was thinking leave the 12 sitting in the box in the hole and duck tape from the bottom of the sub to the bottom of the baffle so the sub doesnt free air. would that work? Link to comment Share on other sites More sharing options...
FreekDesignz Posted November 10, 2010 Author Report Share Posted November 10, 2010 so you bump it every half hour expecting an answer? be patient. Doesnt kicker recommend tuning to like 42hz too? I figured it out from pg 2 on here... http://kicker.com/sites/default/files/2008SoloBaricL5.pdf Quote ♠ FreekDesignz Demo Collection ♠ Everything You Need To Know About Car Audio Torres' Box Tuning Calculator Link to comment Share on other sites More sharing options...
wL<3bass Posted November 10, 2010 Report Share Posted November 10, 2010 I usually use 14-20sqinches for my rule... Sometimes more than 20 is applicable. Quote Vehicle: 1997 S10 Blazer 4dr 4X4 Exterior: Rear End Bagged, Black Grill, Lifted 2" Amplifiers: Rockford Fosgate T8004 & T10001bd Batteries: 2 Stinger SPV35, Kinetik HC2400 Electrical: Big 3, DC Power 290amp Alternator w/ MLA at 15.5v Enclosure: 4.2 ft³ @ 33Hz 84sq.in. of port (20sq.in. per cube) Headunit: Eclipse CD3200 w/ 80G iPod Mids/Highs: Rockford T152s (a-pillars), Rockford T162s (doors) Subwoofers: 1 15" Fi BL Fully Loaded Wire: All 1/0g Kicker Hyperflex My YouTube Videos My Fiberglass A-Pillar Build My "Seamless" Looking Box Build My DD1508 T-Line Bandpass Build "Seamless" w/ Acrylic Windows (for '05 TrailBlazer) My Stealth 8" Fiberglass Build (for '05 TrailBlazer) My Build For A Friend's '08 Cobalt 15" BL Sealed Off From The Trunk My feedback/references... Link to comment Share on other sites More sharing options...
fecupe2001 Posted November 10, 2010 Report Share Posted November 10, 2010 Very nice responds from everybody, yes i´ve tried the whole xmax formulas and let me tell you, i prefer going by trial and error, just get a big ass port and start shrinking it until you find the sweet spot, my DD 2512´s have a big xmax wich results on a big port?? well, that´s according to formulas, but in the real live i got something way different, of course, every system and car it´s different, but hey, i ended up with 16 SQ per cubic feet, while my 1510´s sounded better with 18 SQ per cubic feet and a smaller xmax haha, or better yet, when i tried a single 3518 (same xmax than the 2500 series) i ended up with 20 SQ per cubic feet ON AEROPORTS!!! Anyways, that´s why we love car audio 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...
FreekDesignz Posted November 10, 2010 Author Report Share Posted November 10, 2010 The most I can do is 14.11in^2 per ft^3. I'm to be loud at 21-35Hz I wouldn't be playing very much above that Quote ♠ FreekDesignz Demo Collection ♠ Everything You Need To Know About Car Audio Torres' Box Tuning Calculator Link to comment Share on other sites More sharing options...
fecupe2001 Posted November 10, 2010 Report Share Posted November 10, 2010 14 SQ per cubic feet sounds nice on every sub on earth i think haha, should be more than enough hommie 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...
n8ball2013 Posted November 10, 2010 Report Share Posted November 10, 2010 I am wanting to properly vent a Alpine Type R1242D, and the data sheet gives you all the info you need for create it. Are the specs provided any good, if I am trying to vent it for both SQ and mid SPL? Have I selected a crappy sub to do perform this task? then start your own thread and not thread jack. Quote THERE IS NO BUILD LOG! 1998 Chevy Silverado ext cab Alpine CDA-9887 4 Team Fi 15s 2 Ampere Audio TFE 8.0 2 Ampere Audio 150.4 3 Digital Designs CS6.5 component sets Dual Mechman 370XP Elite alternators inbound! 8 XS Power d3400 6 XS power d680 Second Skin Stinger Tsunami Wiring Sky High A Real Voltmeter not a piece of shit stinger. Link to comment Share on other sites More sharing options...
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