nauc Posted November 13, 2007 Report Share Posted November 13, 2007 trying to figure out what my box is tuned to and how many cubes it is, tried to use the RE box calculator but guess its not very reliable thanks http://img81.imageshack.us/img81/9462/18987315xk3.jpg Quote Alpine 9887, Oz 180CS, RF R500X1D, 12" RE SE Link to comment Share on other sites More sharing options...
joey2714 Posted November 13, 2007 Report Share Posted November 13, 2007 RE calc is fine if you use it right. I got 2.963 ft^3 tuned to 24.43 hz Quote play Moola.com its actually fun and free... click here to join Money games! its just games with free money! Link to comment Share on other sites More sharing options...
andym85 Posted November 13, 2007 Report Share Posted November 13, 2007 i get 2.77cubes at 25.7hz using my calc...thats without sub displacement though...and i made the port 2" wide so i could work with the number easier. Quote i likes me some audio stuff... Link to comment Share on other sites More sharing options...
nauc Posted November 13, 2007 Author Report Share Posted November 13, 2007 i get 2.77cubes at 25.7hz using my calc...thats without sub displacement though...and i made the port 2" wide so i could work with the number easier. if you dont mind, what equations do you use. i REALLY REALLY REALLY want to learn how to do it on my own thanks Quote Alpine 9887, Oz 180CS, RF R500X1D, 12" RE SE Link to comment Share on other sites More sharing options...
andym85 Posted November 13, 2007 Report Share Posted November 13, 2007 Fb = .159*((Av(1.84*10^8)/(Vb(Lv+.823*Av^.5))^.5 Fb = tuning frequency Av = vent area Vb = net volume in cubic inches Lv = effective length of vent effective length = physical length + end correction <---1/2 of the ports width the complicated thing is the port. the proper way to measure port length with an "L" shaped port is measuring down the dead middle, not of the actual wood you are using, and remembering to add half of the ports width to the actual length. then displacement becomes a bitch to figures sometimes when dealing with "L" ports...well not really, its just a bitch tryin to program it into excel so that it will figure itself out... Quote i likes me some audio stuff... Link to comment Share on other sites More sharing options...
nauc Posted November 13, 2007 Author Report Share Posted November 13, 2007 Fb = .159*((Av(1.84*10^8)/(Vb(Lv+.823*Av^.5))^.5 Fb = tuning frequency Av = vent area Vb = net volume in cubic inches Lv = effective length of vent effective length = physical length + end correction <---1/2 of the ports width the complicated thing is the port. the proper way to measure port length with an "L" shaped port is measuring down the dead middle, not of the actual wood you are using, and remembering to add half of the ports width to the actual length. then displacement becomes a bitch to figures sometimes when dealing with "L" ports...well not really, its just a bitch tryin to program it into excel so that it will figure itself out... hmm, looks like fun, but thanks! Quote Alpine 9887, Oz 180CS, RF R500X1D, 12" RE SE Link to comment Share on other sites More sharing options...
andym85 Posted November 13, 2007 Report Share Posted November 13, 2007 its really not that bad...especially if u are decent at excel...i have a spreadsheet for slot ports that i uploaded, if u have excel it should work, although people with vista cant seem to download it...if u want it, i can try and dig it up... Quote i likes me some audio stuff... Link to comment Share on other sites More sharing options...
nauc Posted November 13, 2007 Author Report Share Posted November 13, 2007 its really not that bad...especially if u are decent at excel...i have a spreadsheet for slot ports that i uploaded, if u have excel it should work, although people with vista cant seem to download it...if u want it, i can try and dig it up... thats alright, i should be able to do it by hand thanks tho Quote Alpine 9887, Oz 180CS, RF R500X1D, 12" RE SE Link to comment Share on other sites More sharing options...
nauc Posted November 13, 2007 Author Report Share Posted November 13, 2007 its really not that bad...especially if u are decent at excel...i have a spreadsheet for slot ports that i uploaded, if u have excel it should work, although people with vista cant seem to download it...if u want it, i can try and dig it up... actually, what does ^ mean... ex. (10^ thats not 10 to the 8th is it, been out of school too long Quote Alpine 9887, Oz 180CS, RF R500X1D, 12" RE SE Link to comment Share on other sites More sharing options...
nauc Posted November 13, 2007 Author Report Share Posted November 13, 2007 and im assuming id use cubic inches for Av and inches for Lv thanks for helpin my dumbazz Quote Alpine 9887, Oz 180CS, RF R500X1D, 12" RE SE Link to comment Share on other sites More sharing options...
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