jeffrm Posted July 21, 2012 Report Share Posted July 21, 2012 What exactly causes this? Im mainly asking because I think I have some in my new wall. 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...
jeffrm Posted July 21, 2012 Author Report Share Posted July 21, 2012 The box I built is 49wide x 35tall x 23deep with a port thats 33.5tall x 6.5wide x 20deep it gives me 13.57cubes after displacement of subs and port. I didnt factor in the braces which are 33.5 x 1.25 and 20.75 x 1.25 round wood. 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...
john253a Posted July 21, 2012 Report Share Posted July 21, 2012 (edited) you shouldest have any noise, What you're probably hearing is you subs bottoming out or clipping, due to an over size box and too much power how to you have them wied, 9cuft including sub displacement, @ 1200ms is all you should run, if you run more power you'll need to drop the box size down Edited July 21, 2012 by john253a Quote Link to comment Share on other sites More sharing options...
jeffrm Posted July 21, 2012 Author Report Share Posted July 21, 2012 No clipping dd1 tuned. Ive got 4 obsidian 15" dual 2s wired in series parallel at 1ohm on my rd 3250 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...
bkolfo4 Posted July 21, 2012 Report Share Posted July 21, 2012 Is that port 20" deep, or is it an L? If it is 20" deep and the box is only 23" deep, that is a problem. 6.5" wide port with a choked off opening inside the box that is only 2.25" wide. If it is an L, then it is longer than 20". Would be 23" minimum. 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...
jeffrm Posted July 21, 2012 Author Report Share Posted July 21, 2012 (edited) I used Torres to design the box and it told me physical port length 12in so thats how long the port wall is behind the double baffle. What I put in for port was 20in Edited July 21, 2012 by jeffrm 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...
bkolfo4 Posted July 21, 2012 Report Share Posted July 21, 2012 So if you have a 12" piece behind a double baffle wall, you have 13.5" total from the face of the wall to the rear of the port wall, is that what you are saying? That leaves an opening 8.75" wide inside the box? Do you have any type of 45 in the corner behind the port? Just trying to determine if your box design is what you think it is. . .Port noise can get very loud when you are playing below tuning. 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...
jeffrm Posted July 21, 2012 Author Report Share Posted July 21, 2012 Yes the piece behind the double is 12in. And I do have a 45 in the port corner 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...
john253a Posted July 21, 2012 Report Share Posted July 21, 2012 (edited) pics might help i thought you only had 2 15" in that box As for port, I would suggested 280-320sq"@37-42hz secondly does it do it all the time or only on some notes, how did you set your dd1 0 on hu and -10 on amp i un mine at 0 and -3, but on you setup youll def need -10 Edited July 21, 2012 by john253a Quote Link to comment Share on other sites More sharing options...
bassface Posted July 21, 2012 Report Share Posted July 21, 2012 Port noise is an effect of the port being too small. The port not only pushes air out, but takes air in also. So if the port is too small there isnt enough room to do both quietly. Quote Link to comment Share on other sites More sharing options...
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