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thecat666
09-09-2009, 12:40 AM
i have a slot port that i want to divide by 2 so i can have port on each side of box, do i just divide the port by 2 or is their a formula for splitting slot ports into 2. all this so i can then have sub can sit in the middle of cab.

was told this,
Half the opening, keep the length the same. Will be near as **** it the same tuning.

3.4 cft internal. the port height is 419mm that will stay the same the width of port is 88mm that will half to 44mm length to stay at 20.i was given formula to work out width of port. cuft of box after displacement x 16 = sq in of port opening then dividing this by internal height gives me the port width.recomended lengh for dd tuning was 20 inches gives between 35-40 hz.

so my way of thinking is 88mm x 419mm / 508mm long
eg 44mm x 419 /508 long x2. is this correct
1 port on each side of box

Goindef154
04-15-2010, 04:39 AM
Funny enough I have this same question, I know this post is old but if someone could answer I'd appreciate it :D

streetbeater07
04-15-2010, 04:46 AM
ports same length. area of port/ 2

Goindef154
04-15-2010, 05:34 AM
Yep I ****ed up then lol, I'll have to wing it with the cuts I made :D

RAM_Designs
04-15-2010, 07:11 AM
Two slot ports adding up to a desired port area need to be about 20% longer than a single larger port to get the same tuning.

bubbagumper6
04-15-2010, 07:20 AM
Two slot ports adding up to a desired port area need to be about 20% longer than a single larger port to get the same tuning.

this. It's not just as easy as dividing them and calling it done.

Subwoofer Enclosure Calculators, Fraction to Decimal, Parallel, Series, Port Length and Volume Calculators (http://www.the12volt.com/caraudio/boxcalcs.asp#por)

stickytak
04-15-2010, 08:11 AM
you also have to think that your not just doing (port length)/2.

you should be doing ((port length)-(width of wood))/2