LZTYBRN Posted July 3, 2012 Report Share Posted July 3, 2012 Both of you still have not figured out port area is NOT related to box volume. Bingo bango. So what is it related to then, cone area? Quote Link to comment Share on other sites More sharing options...
Joe X Posted July 3, 2012 Report Share Posted July 3, 2012 (edited) For those interested vent area is related to the subwoofer parameters themselves and tuning frequency, for example here is the Richard Small's method for minimum aero port diameter, this one is based in tuning frequency and displacement (Vd): Vd = Sd x Xmax Minimum aero port vent diameter = 39.37(FB x VD)^.5 Then there is the vent mach method which is based on acoustic power and tuning frequency (neither is there agreement in what fraction of the speed of sound should be adequate for a port,,winisd puts it at 15% but many people say it should stay below 5%). Unhappily is very common to find companies listing incomplete specs like DC audio, AQ, and Sundown. Edited July 4, 2012 by Joe X Quote Link to comment Share on other sites More sharing options...
teamace24 Posted July 4, 2012 Report Share Posted July 4, 2012 Interested if anybody has more info on this topic about port area and how its best to be chosen in relation to tuning and other things. 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...
lton85 Posted July 4, 2012 Report Share Posted July 4, 2012 (edited) For those interested vent area is related to the subwoofer parameters themselves and tuning frequency, for example here is the Richard Small's method for minimum aero port diameter, this one is based in tuning frequency and displacement (Vd): Vd = Sd x Xmax Minimum aero port vent diameter = 39.37(FB x VD)^.5 Then there is the vent mach method which is based on acoustic power and tuning frequency (neither is there agreement in what fraction of the speed of sound should be adequate for a port,,winisd puts it at 15% but many people say it should stay below 5%). Unhappily is very common to find companies listing incomplete specs like DC audio, AQ, and Sundown. hey man, could help me in this calculation? I live in Brazil we use standard measures other than yours, what would be the ideal port for two sub Fosgate P3? VD = 570cm² x 1,5 cm Fb box = 30hz ???????????? Edited July 4, 2012 by lton85 Quote Link to comment Share on other sites More sharing options...
bkolfo4 Posted July 4, 2012 Report Share Posted July 4, 2012 http://www.carstereo.com/help/Articles.cfm?id=31 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...
lton85 Posted July 4, 2012 Report Share Posted July 4, 2012 http://www.carstereo...icles.cfm?id=31 tanks ! Quote Link to comment Share on other sites More sharing options...
Sonic Posted July 5, 2012 Report Share Posted July 5, 2012 As a box designer and builder my self, I have followed and checked Joe X and also others work and I can tell you this, he know his stuff !!!! Quote Link to comment Share on other sites More sharing options...
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