we_drop_bass Posted July 24, 2015 Report Share Posted July 24, 2015 So this may be a stupid question, but doing a J shaped port as opposed to an L shaped port had never occurred to me. Is there any difference in using one or the other? Perhaps the J port has the benefit of being fastened to the outer wall to provide stronger bracing than the "free floating" extension of an L port that only fastens to the top and bottom. Maybe the only benefit to one or the other is the ability to locate the sub further from the port opening? Found these pictures of Joe X's boxes... 2008 Denali Singer 270 2 XS D3400s under hood Sundown SCV-6000D SHCA 1/0 Q Logic Kickpanels - lame 5.25 components for now ..... Planning/acquiring everything else Link to comment Share on other sites More sharing options...
reedal Posted July 24, 2015 Report Share Posted July 24, 2015 Very good question. Tuned in for the answer SMD Tool Map https://www.stevemeadedesigns.com/board/topic/193176-smd-tool-map-new-november-2014/ Build log https://www.stevemeadedesigns.com/board/topic/197217-reeds-03-tahoe-hat-sqaq-singer-xs-shca-cockbox-80prs/?page=32 Link to comment Share on other sites More sharing options...
Triticum Agricolam Posted July 24, 2015 Report Share Posted July 24, 2015 I would use the L shaped port when possible. A 90 corner is going to cause less air resistance than a 180 degree corner. The only time I use 180 degree corners is when I really have no other choice. "Nothing prevents people from knowing the truth more than the belief they already know it.""Making bass is easy, making music is the hard part."Builds: Link to comment Share on other sites More sharing options...
we_drop_bass Posted July 24, 2015 Author Report Share Posted July 24, 2015 Makes sense, I guess in that particular design maybe it was just an issue with proximity to the woofer that warranted the 180 degree turn. 2008 Denali Singer 270 2 XS D3400s under hood Sundown SCV-6000D SHCA 1/0 Q Logic Kickpanels - lame 5.25 components for now ..... Planning/acquiring everything else Link to comment Share on other sites More sharing options...
mothra Posted July 24, 2015 Report Share Posted July 24, 2015 port velocity changes when adding bends, it lowers it's speed with every bend. if nothing changes, nothing changes You don't know what you don't know, till you don't know Link to comment Share on other sites More sharing options...
Joe X Posted July 25, 2015 Report Share Posted July 25, 2015 So this may be a stupid question, but doing a J shaped port as opposed to an L shaped port had never occurred to me. Is there any difference in using one or the other? Perhaps the J port has the benefit of being fastened to the outer wall to provide stronger bracing than the "free floating" extension of an L port that only fastens to the top and bottom. Maybe the only benefit to one or the other is the ability to locate the sub further from the port opening? Found these pictures of Joe X's boxes... The port style on the second box you can use if you need a box to be wide rather than deep or to keep out the inner end of the port away from the sub. Link to comment Share on other sites More sharing options...
diegoclass2010 Posted July 25, 2015 Report Share Posted July 25, 2015 when i saw this on mobile during work i thought they were comparing L shape ports vs kerf ports, i got excited, now in computer i see the pictures and that's not the case. anyways still a good read and great info learned. Link to comment Share on other sites More sharing options...
MADVIBES Posted July 25, 2015 Report Share Posted July 25, 2015 There is only one true way to test this, build both and term lab it, well the output shouldnt be the only criteria. If you had a program like linear x's lms you could get qan idea of the frequency response of the box and use the tl for output testing. DB DRAG PSYCHLONE PRO 156.3 30 SECOND AVERAGE FO MAX AT 26HZ LEGAL DASH DRIVER DOOR OPEN 158.0@30 HZ MY BEST SO FAR, HOPEFULLY A 160 COME FEBUARY. 156.9@26hz 158.0@30hz Link to comment Share on other sites More sharing options...
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