andym85 Posted January 27, 2007 Report Share Posted January 27, 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 Quote i likes me some audio stuff... Link to comment Share on other sites More sharing options...
F N LO Posted January 27, 2007 Author Report Share Posted January 27, 2007 sick! jsut what i was looking for bro, thanx! Quote Link to comment Share on other sites More sharing options...
F N LO Posted January 28, 2007 Author Report Share Posted January 28, 2007 ok looks liek im going to have to check over my last years highschool books and re read formulas... haham, but is this for a slot port?? or a tube port?? or is will it just give me the amount, sq.inches that i need?? Quote Link to comment Share on other sites More sharing options...
David Posted January 28, 2007 Report Share Posted January 28, 2007 both shouldnt matter much, area is area wether it be round or square, you just need the righ formula for both. Rectangle length * width Square side2 Cone (surface) pi * radius * side Circle pi * radius2 Quote Link to comment Share on other sites More sharing options...
Ray Posted January 28, 2007 Report Share Posted January 28, 2007 all these posts and we still dont know what subs you have?? The "tuning" freq is where the rolloff of the enclosure starts to happen, say your sub has a high fs.. well then you will never play down that low, shit there are only a handfull of woofers that can play 30-32hz with authority. Quote 2008 California state record holder 157.2 Bassrace2009 California state record holder 157.0 BassraceRollin 50's 158.7db2009 King of Cali Bassrace2009 USACi score 160.5 @ 42hz Link to comment Share on other sites More sharing options...
F N LO Posted January 28, 2007 Author Report Share Posted January 28, 2007 i have 2 ten inch clarion pxw.... there are in a ported box that i made and right now they are loud, but i am looking for a design that will bring them to the max, i have lots of room, i was going to go with a t/line, but i dont have enough mdf available right now... any othr ideas for a box??? how much cubft. is to much for a set of tens?? Quote Link to comment Share on other sites More sharing options...
F N LO Posted January 28, 2007 Author Report Share Posted January 28, 2007 o yea dont know if i made it clear but i want these subs to POUND however it is my daily driver and i dont want something that will make the subs over work themselves... Quote Link to comment Share on other sites More sharing options...
F N LO Posted January 28, 2007 Author Report Share Posted January 28, 2007 just to let everyone know, i am going to build a ported box, tuned to 40hz, slot ported... 5.2 cub feet with a 4'' by 15'' slot port 17'' long.... ill let everyone know how it turns out...my first time using my new brad nailer and router so wish me luck!! lol Quote Link to comment Share on other sites More sharing options...
F N LO Posted January 28, 2007 Author Report Share Posted January 28, 2007 here are a couple of tuning calculators... http://www.linearteam.dk/default.aspx?page...=ventcalculator http://www.carstereo.com/help/Articles.cfm?id=31 general rule of thumb is like 12"-15" of port area per cubic foot of box. longer port=lower tuning. shorter port=higher tuning. if you increase your port area your tuning freq. gets higher, if u decrease your port area, your tuning freq. gets lower. couldnt tell if you can find the cubic footage for your box or not, im sure u probably can, but just do l*w*d (internally and in inches) and divide by 1728 to get your cubic feet. dont forget that sub and port displacement is also gonna take up volume in your box... alright now im a lil confused, because i tryed that l X wX h, and then div. by 1728, and i got like 5.3 ft3 and then i tryed the same measurements on, the12volt.com and only got 13 ft3.... can someone help me??? Quote Link to comment Share on other sites More sharing options...
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