jeffrm Posted July 22, 2012 Author Report Share Posted July 22, 2012 I did some measuring today and the port wall is 13.5" long and the opening at the back is 8.75" Quote 03 tahoe z71 4 death penalty 18s 2 ampere audio 3800s @ .5 each 18v 156.7 @ 35hz 158.5 @ 50hz Link to comment Share on other sites More sharing options...
Joe X Posted July 22, 2012 Report Share Posted July 22, 2012 Does the port turn? or is just those 13.5" front to back. Quote Link to comment Share on other sites More sharing options...
jeffrm Posted July 22, 2012 Author Report Share Posted July 22, 2012 No turn Quote 03 tahoe z71 4 death penalty 18s 2 ampere audio 3800s @ .5 each 18v 156.7 @ 35hz 158.5 @ 50hz Link to comment Share on other sites More sharing options...
Joe X Posted July 22, 2012 Report Share Posted July 22, 2012 Just enter the 13.5" port length in Torres, it gives like 37Hz. This is just to point out that you are not getting the tuning you designed for. Quote Link to comment Share on other sites More sharing options...
AB18VFL Posted July 22, 2012 Report Share Posted July 22, 2012 obsidian subs are supposed to be used with VERY small ports. Youre hearing the subs unloading. a smaller port would sound much better. 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...
bkolfo4 Posted July 22, 2012 Report Share Posted July 22, 2012 Just enter the 13.5" port length in Torres, it gives like 37Hz. This is just to point out that you are not getting the tuning you designed for. With a 45 in the corner, and an opening that is only 2" wider that the port, the effective length of that port is longer than 13.5". obsidian subs are supposed to be used with VERY small ports. Youre hearing the subs unloading. a smaller port would sound much better. This made me laugh!! 55 sqin is not too much port for a 15" woofer. 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...
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