Decaf Posted November 6, 2007 Report Share Posted November 6, 2007 box is 30l x 16h x 23d tuned to 32hz with ~50sqin port 15" re se or fi q both give different port lengths and net volume so which is more accurate? Quote Link to comment Share on other sites More sharing options...
andym85 Posted November 6, 2007 Report Share Posted November 6, 2007 what answers are they giving ya? but anyways, i did it with the port 3.5"wide and 14.5"tall...for 32hz, i get around 22"long...box is 4.75cubes net Quote i likes me some audio stuff... Link to comment Share on other sites More sharing options...
Decaf Posted November 6, 2007 Author Report Share Posted November 6, 2007 Net Volume: 4 cubic feet Tuning Frequency: 32 Hz Port Width: 3.5 inches Port Area: 50.75 Square Inches Port Length: 27.5 inches port length 1: 18 port length 2: 4.25 External Dimensions: 30 wide x 16 tall x 23 deep subwoofertools 30x16x23 3.5" wide port total port lenth 27.5 port area 50.75 port length 1 - 18.75 port length 2 - 2.75 box volume 4.325 tuning 30.76 re box caculator if i insert 28.25 instead of 30 for length in re box calculator, tuning and volume match subwoofertools so which is accurate and which is rounding numbers/using different formula my guess is that the re doesnt account for woofer displacement and subwoofer does... is this the smoking gun this might only be a slight variation and ultimately not be noticable only to the most decerning ear, but it still makes me wonder Quote Link to comment Share on other sites More sharing options...
needlesnpins Posted November 6, 2007 Report Share Posted November 6, 2007 Net Volume: 4 cubic feet Tuning Frequency: 32 Hz Port Width: 3.5 inches Port Area: 50.75 Square Inches Port Length: 27.5 inches port length 1: 18 port length 2: 4.25 External Dimensions: 30 wide x 16 tall x 23 deep subwoofertools 30x16x23 3.5" wide port total port lenth 27.5 port area 50.75 port length 1 - 18.75 port length 2 - 2.75 box volume 4.325 tuning 30.76 re box caculator if i insert 28.25 instead of 30 for length in re box calculator, tuning and volume match subwoofertools so which is accurate and which is rounding numbers/using different formula my guess is that the re doesnt account for woofer displacement and subwoofer does... is this the smoking gun this might only be a slight variation and ultimately not be noticable only to the most decerning ear, but it still makes me wonder i think i might have to agree with your theory. i used the RE calc on my last box and it was my last one. i heard lost of trash about it but i think it was because you have to have some commen sence about it when it comes to port area. you can tune any size port to a tuning but you gotta realize to have a certain amount of sq in" while doing it. Quote 12" fi Bl loaded RF power 1000 RF 25 farad cap 3SIXTY.2 processing 200A Alt 01' grand prix GT Link to comment Share on other sites More sharing options...
andym85 Posted November 6, 2007 Report Share Posted November 6, 2007 yea, it may be the sub displacement...i get 27.5" deep for the port, 31.5946hz, 4.1023cubes net Quote i likes me some audio stuff... Link to comment Share on other sites More sharing options...
andym85 Posted November 6, 2007 Report Share Posted November 6, 2007 its all pretty close...u probably wont notice the difference between 30-32hz to the ear that much... Quote i likes me some audio stuff... Link to comment Share on other sites More sharing options...
Decaf Posted November 6, 2007 Author Report Share Posted November 6, 2007 thanks for input as always. i was just trying to clear up the difference between the two since this isnt the first time this argument has been made on this forum. my old box was tuned to 30hz and as long as i can carry the lows like i did i will be happy. you gotta love the 3d on re calc tho Quote Link to comment Share on other sites More sharing options...
jonathancullen89 Posted November 9, 2007 Report Share Posted November 9, 2007 on subwoofer tools i was reading that re did not account for area lost for the subwoofer displacement, i think they account for the port displacement. (if they didnt that would be stupid) Quote 1992 cavalier build 1992 blazer s10 kenwood cd hifonics hfi2500d 6 soon to be 12 12" hifonics hfi12d4's shit ton-o-wire Blurred Vision Audio Team SMD feedback/refs. clicky!- Link to comment Share on other sites More sharing options...
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