Texas Tech Posted January 31, 2008 Author Report Share Posted January 31, 2008 yea i know it sure is debateable, my reasoning is on jlaudio site, it says a wall of the enclosure that is part of the port, in most cases (like simple L ports or T ports) the wall does extend the port, but in this case, if the back enclosure wall does extend the port, then the port would have two different widths, like i stated earlier so, i duno i wish i was a professional box builder to know the answer, or the equipment to test this stuff and figure out the tuning frequency. Like test the frequency with the exact same physical length of the port, but one enclosure like the one shown on the 7th post, and then one similar to the 9th post (referring to the distance from the end of the port to the back wall of the enclosure, that would be the variable in the experiment). Quote Baylor University Accounting Link to comment Share on other sites More sharing options...
andym85 Posted January 31, 2008 Report Share Posted January 31, 2008 yea...there is also a problematic spot i run into when doing "L" ports....like when u extend the port all of the way back that you can before doing the bend...so say ur box is 15" deep internally with a 3"wide port...u would take the wood back 12"....but what if u only want an additional inch of length, regardless of end correction? since u measure down the middle to find length then we have a problem....u see what im saying? Quote i likes me some audio stuff... Link to comment Share on other sites More sharing options...
Texas Tech Posted January 31, 2008 Author Report Share Posted January 31, 2008 its hard to understand, a fast paint diagram would help .can you? Quote Baylor University Accounting Link to comment Share on other sites More sharing options...
Texas Tech Posted January 31, 2008 Author Report Share Posted January 31, 2008 (edited) actually i think i know what your saying ill show you a diagram and how i was taught to measure it 30 more seconds.... Edited January 31, 2008 by Texas Tech Quote Baylor University Accounting Link to comment Share on other sites More sharing options...
Texas Tech Posted January 31, 2008 Author Report Share Posted January 31, 2008 You would measure down the middle, now the wood piece that actually creates the port, it has a thickness, lets say its .5 in. thick. That is still considered port length. that is still measured as physical port. So the physical port length would be 19.5 in. then you would add the end correction being 1.5 in., making the effective port length 21 inches long. Quote Baylor University Accounting Link to comment Share on other sites More sharing options...
andym85 Posted January 31, 2008 Report Share Posted January 31, 2008 k...this might get fuzzy, but here i go..its kinda hard to explain... if you go by the below pic, what if i just want the additional 1"? if you go by this pic, what if i just want it to be 13.5" (the 2.25" in the pic is half the ports width plus the thickness of the wood) just seems to be some fuzzy areas that i wish i knew more about.... Quote i likes me some audio stuff... Link to comment Share on other sites More sharing options...
Texas Tech Posted January 31, 2008 Author Report Share Posted January 31, 2008 look at my diagram and tell me if what i drew is what you were talking about Quote Baylor University Accounting Link to comment Share on other sites More sharing options...
Texas Tech Posted January 31, 2008 Author Report Share Posted January 31, 2008 Here it shows, you add 16+1.5(red line)+1.5(green line)+.5(woods thickness, the dark purple line). That is where the physical port length stops. that is 19.5 inches. Quote Baylor University Accounting Link to comment Share on other sites More sharing options...
andym85 Posted January 31, 2008 Report Share Posted January 31, 2008 yea...thats looks correct, but what im saying is what if i want my port length to stop somewhere in that green line...then what? Quote i likes me some audio stuff... Link to comment Share on other sites More sharing options...
Texas Tech Posted January 31, 2008 Author Report Share Posted January 31, 2008 yea our diagrams are similar, in that the numbers are differnet, but the concept is still the same. If you want it to be 13.5 you have to adjust your port, or the depth of your box. Make the box deeper, to where the distance from the end of the port to the back wall of the enclosure is longer than your ports width, you would have to adjust your ports width and length and the depth of your enclosure to make it work, or continue with this same concept, and make it work that way. Quote Baylor University Accounting Link to comment Share on other sites More sharing options...
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