teamace24 Posted January 8, 2012 Report Share Posted January 8, 2012 I usually do 15 or 16 inches of port per cube. Was wondering for future box building use, what to use for port area since ive never figured out what this rule of thumb is really about or means i just use it since its recommended. Can anyone explain it? for example when it concerns subs like kicker cvx, L7, skar, sundown sa stuff like that. Thanks im really into being loud but sounding very clean as well and hitting all of the higher bass frequencies as well if this has any affect or whatever on port area. Quote 1st Setup(SOLD):2007 GMC YukonPioneer Avic F90bt Audiocontrol Epicenter2 Audioque SDC2.5 15 subs8.7 cubes at 37hz build DONEAudioque 1200d (Audioque 1200d Sold, similar performance to my ap1500)Diamond Audio Hex 6.5 Mids n TweetsCerwin Vega Exl 400 4 channel Bridged(also have MTX 4004 not being used)1 Run of power Knu Fleks 4 Gauge2 Cheap stock Battery setup2nd Setup (SOLD):2007 GMC YukonPioneer Avic F90bt Audiocontrol Epicenter2 15 Kicker cvx (maybe two SA 15 in future)7 cubes net tuned at 34hzAlphasonik Old school 1600rms (ap 1500d sold GREAT Budget amp)JBL 6.5 Power Series Components, Infinity Kappa 6.5 3 ways, and 2 Kicker KS Tweets (LOUD)Cerwin vega exl4001 run knu Fleks OFC 0 gaugeBig 3 done1 Odyssey 1500, 1 optima yellow top d31 Link to comment Share on other sites More sharing options...
teamace24 Posted January 10, 2012 Author Report Share Posted January 10, 2012 Whats the difference if 2 boxes were say 4 cubes with a tuning of 32hz, same subs same power, but one with 16 inches of port area per cube and the other with 12 inches of port per cube? Quote 1st Setup(SOLD):2007 GMC YukonPioneer Avic F90bt Audiocontrol Epicenter2 Audioque SDC2.5 15 subs8.7 cubes at 37hz build DONEAudioque 1200d (Audioque 1200d Sold, similar performance to my ap1500)Diamond Audio Hex 6.5 Mids n TweetsCerwin Vega Exl 400 4 channel Bridged(also have MTX 4004 not being used)1 Run of power Knu Fleks 4 Gauge2 Cheap stock Battery setup2nd Setup (SOLD):2007 GMC YukonPioneer Avic F90bt Audiocontrol Epicenter2 15 Kicker cvx (maybe two SA 15 in future)7 cubes net tuned at 34hzAlphasonik Old school 1600rms (ap 1500d sold GREAT Budget amp)JBL 6.5 Power Series Components, Infinity Kappa 6.5 3 ways, and 2 Kicker KS Tweets (LOUD)Cerwin vega exl4001 run knu Fleks OFC 0 gaugeBig 3 done1 Odyssey 1500, 1 optima yellow top d31 Link to comment Share on other sites More sharing options...
SnowDrifter Posted January 10, 2012 Report Share Posted January 10, 2012 (edited) IIRC bigger port means louder but peakier, less power handling below tuning point. Smaller port is just the opposite And the port/cube is just a very general rule of thumb. How much port area a person 'really' needs is based off of air displacement by the sub(s) and tuning point Edited January 10, 2012 by SnowDrifter Quote ~~~~~~~~SAY NO TO PHOTOBUCKET~~~~~~~~ Snow's DD-1 tracks here: https://www.stevemeadedesigns.com/board/topic/167433-snows-dd-1-tracks/ My take on OFC vs CCA: https://www.stevemeadedesigns.com/board/topic/110381-things-that-piss-you-off-in-the-car-audio-world/?do=findComment&comment=2461444 Link to comment Share on other sites More sharing options...
AB18VFL Posted January 10, 2012 Report Share Posted January 10, 2012 when i build boxes, i ask the person what kind of music they mainly listen to. If they listen to rock, country or metal, i'll do 12-13. I think it lets the bass guitar and kickdrums sound really nice. If the person listens to alot of rap, techno or dubstep, i'll do 14-16 depending on how much air they want to move. Quote SUBSCRIBE AT YOUTUBE! 18abVFL < CLICK!! 2005 Subaru Impreza My build log. Head unit- Kenwood Excelon KDC-X695 Front doors- Rockford Fosgate 6.5" Prime components Rear doors- Rockford Fosgate 4" Punch coaxials Sub amp- Audiopipe AP18001d Subs- Two American Bass TNT 10"s Box- 2.6 cubes @ 34hz, 36in of port Big 3 & run of Raptor 1/0 to rear powercell TEAM 808 UPSTATE NY. Can it be heard 2 blocks away, thats how i rate systems. Link to comment Share on other sites More sharing options...
teamace24 Posted January 10, 2012 Author Report Share Posted January 10, 2012 Do you know what is the method, rule, or just how do you come up with the right port area using air displacement and tuning? For example a sub like a kicker cvx 15 or skar 15 vvx or sa 15 how do i go about determining what to use? By peaky do you mean around the tuning or where? Quote 1st Setup(SOLD):2007 GMC YukonPioneer Avic F90bt Audiocontrol Epicenter2 Audioque SDC2.5 15 subs8.7 cubes at 37hz build DONEAudioque 1200d (Audioque 1200d Sold, similar performance to my ap1500)Diamond Audio Hex 6.5 Mids n TweetsCerwin Vega Exl 400 4 channel Bridged(also have MTX 4004 not being used)1 Run of power Knu Fleks 4 Gauge2 Cheap stock Battery setup2nd Setup (SOLD):2007 GMC YukonPioneer Avic F90bt Audiocontrol Epicenter2 15 Kicker cvx (maybe two SA 15 in future)7 cubes net tuned at 34hzAlphasonik Old school 1600rms (ap 1500d sold GREAT Budget amp)JBL 6.5 Power Series Components, Infinity Kappa 6.5 3 ways, and 2 Kicker KS Tweets (LOUD)Cerwin vega exl4001 run knu Fleks OFC 0 gaugeBig 3 done1 Odyssey 1500, 1 optima yellow top d31 Link to comment Share on other sites More sharing options...
bkolfo4 Posted January 10, 2012 Report Share Posted January 10, 2012 "peaky" means a big hump in the frequency response just above the F3 point. A box being peaky is not caused by the port size (unless it is undersized and has too much compression), the tuning frequency vs. the box size vs. the driver parameters will determine the frequency response. High Q designs will have more peak. Usually works out great in a car where cabin gain boosts the lower frequencies. That is why you see car subs tuned 30-35 Hz, but home subs tuned down around 20 with drivers that have different t/s parameters (or amps with EQ on the lower end). 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...
teamace24 Posted January 10, 2012 Author Report Share Posted January 10, 2012 "peaky" means a big hump in the frequency response just above the F3 point. A box being peaky is not caused by the port size (unless it is undersized and has too much compression), the tuning frequency vs. the box size vs. the driver parameters will determine the frequency response. High Q designs will have more peak. Usually works out great in a car where cabin gain boosts the lower frequencies. That is why you see car subs tuned 30-35 Hz, but home subs tuned down around 20 with drivers that have different t/s parameters (or amps with EQ on the lower end). So say for example a kicker cvx15 box is built towards the compact (smaller) size of the recommended specs tuning low like 32hz or high like 36hz make it peaky? Which way the lower or the highest? Sorry if i still cant quite understand. Quote 1st Setup(SOLD):2007 GMC YukonPioneer Avic F90bt Audiocontrol Epicenter2 Audioque SDC2.5 15 subs8.7 cubes at 37hz build DONEAudioque 1200d (Audioque 1200d Sold, similar performance to my ap1500)Diamond Audio Hex 6.5 Mids n TweetsCerwin Vega Exl 400 4 channel Bridged(also have MTX 4004 not being used)1 Run of power Knu Fleks 4 Gauge2 Cheap stock Battery setup2nd Setup (SOLD):2007 GMC YukonPioneer Avic F90bt Audiocontrol Epicenter2 15 Kicker cvx (maybe two SA 15 in future)7 cubes net tuned at 34hzAlphasonik Old school 1600rms (ap 1500d sold GREAT Budget amp)JBL 6.5 Power Series Components, Infinity Kappa 6.5 3 ways, and 2 Kicker KS Tweets (LOUD)Cerwin vega exl4001 run knu Fleks OFC 0 gaugeBig 3 done1 Odyssey 1500, 1 optima yellow top d31 Link to comment Share on other sites More sharing options...
icewall Posted January 10, 2012 Report Share Posted January 10, 2012 should be fine around 14-16 per cubic foot. I tend to like 14-15 as that gets the port shorter and still gives plenty of air movement without noise. Quote Link to comment Share on other sites More sharing options...
teamace24 Posted January 10, 2012 Author Report Share Posted January 10, 2012 Ive built over 6 boxes but usually i do the 15-16 but i just always wondered how the sound would be different if i went with say 12-14 of port. Quote 1st Setup(SOLD):2007 GMC YukonPioneer Avic F90bt Audiocontrol Epicenter2 Audioque SDC2.5 15 subs8.7 cubes at 37hz build DONEAudioque 1200d (Audioque 1200d Sold, similar performance to my ap1500)Diamond Audio Hex 6.5 Mids n TweetsCerwin Vega Exl 400 4 channel Bridged(also have MTX 4004 not being used)1 Run of power Knu Fleks 4 Gauge2 Cheap stock Battery setup2nd Setup (SOLD):2007 GMC YukonPioneer Avic F90bt Audiocontrol Epicenter2 15 Kicker cvx (maybe two SA 15 in future)7 cubes net tuned at 34hzAlphasonik Old school 1600rms (ap 1500d sold GREAT Budget amp)JBL 6.5 Power Series Components, Infinity Kappa 6.5 3 ways, and 2 Kicker KS Tweets (LOUD)Cerwin vega exl4001 run knu Fleks OFC 0 gaugeBig 3 done1 Odyssey 1500, 1 optima yellow top d31 Link to comment Share on other sites More sharing options...
TeamHT Posted January 10, 2012 Report Share Posted January 10, 2012 Then build it. Build boxes with comparable volumes with lower port area per cube. Design, test, test, rebuild, and then test. Quote Tell me...does this smell like chloroform to you? Link to comment Share on other sites More sharing options...
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