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<blockquote data-quote="shredder1" data-source="post: 8578275" data-attributes="member: 658920"><p>I modeled the same box that CSCstang designed for my car... the curve looks close but not as smooth on the low end... then I noticed that the parameters really changed... I think I might have entered the impedance incorrectly... it asked for Re and it was a dual 4, I entered 1.8 ohms off the list not thinking that maybe I should have entered 3.8 ohms instead... as the list is for a dual 2... also the Znom... is that something that I should correct as parallel and series will be different and just use the nominal number?.. looks like the only real change I can see is the Bl ... all the others seem OK... I can not screenshot so I took a picture... <a href="http://i.imgur.com/X31YxtJ.jpg" target="_blank">http://i.imgur.com/X31YxtJ.jpg</a> ... I suppose the differences in parameters are not allowing me to duplicate the design... the ACTUAL port is 81in2/ 32&quot; or so long tuned to 30 hz in a 5 ft3 net box... the program as it is seeing the driver parameters presently is telling me to go over 40&quot; long for the same net vol with the same vent... any ideas or advice that might make this easier especially with Re, Znom and parallel/saries and what to look for?</p></blockquote><p></p>

[QUOTE="shredder1, post: 8578275, member: 658920"] I modeled the same box that CSCstang designed for my car... the curve looks close but not as smooth on the low end... then I noticed that the parameters really changed... I think I might have entered the impedance incorrectly... it asked for Re and it was a dual 4, I entered 1.8 ohms off the list not thinking that maybe I should have entered 3.8 ohms instead... as the list is for a dual 2... also the Znom... is that something that I should correct as parallel and series will be different and just use the nominal number?.. looks like the only real change I can see is the Bl ... all the others seem OK... I can not screenshot so I took a picture... [URL="http://i.imgur.com/X31YxtJ.jpg"]http://i.imgur.com/X31YxtJ.jpg[/URL] ... I suppose the differences in parameters are not allowing me to duplicate the design... the ACTUAL port is 81in2/ 32" or so long tuned to 30 hz in a 5 ft3 net box... the program as it is seeing the driver parameters presently is telling me to go over 40" long for the same net vol with the same vent... any ideas or advice that might make this easier especially with Re, Znom and parallel/saries and what to look for? [/QUOTE]

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