I decided it was best to space the internal ports away from each other due to possible vibrations and due to the fact i believe the roundness of the ports will cause a benefit spl wise from the front ports externally and the rest of the volume of the box can be more effectively used behind the internal ports. then to figure height you take your 15.5 height and space each port evenly from each other and the top and bottom boards because you dont want the ports touching the top or bottom boards any more than you want your external ports touching the top and bottom boards. So if the ports are 16.5 long and you have 23 inches internal you have 6.5 inches left so you place the ports 3.25 inches from the back of the front ports and 3.25 inches from the back wall. Then for the interior ports you want them evenly spaced depth wise from your front chamber ports and the back wall of your box internally. Also make sure when you space them that they are planned so that they arent right up against the top and bottom panel. when you build the box you want the front ports one over the other evenly spaced there will be four of them on each front chamber.
#Winisd abc box how to#
Posted on Saturday, J12:47 GMTok heres how to lay it out these dememnsions i gave you are internal so remember that. New demesions for chamber one including the subwoofer this timeĬhamber (45/64) wide by 15.5 high by 23 deep=5.09644395254629 cf ill figure that in next so chamber one will be a tad wider now Sorry i realized the chamber measurements werent clear so here you goĬhamber 1. Youll do four 2 inch ports on the front of each chamber 16.5 inches deep and four 2 inch ports internally as instructed above If i charted this box by theory right you should hit from to 20 hz to 55 hz after that you prob wont notice much except by cabin gain These demensions are internal so add 1.5 inches to length width and height because well be using.
Only thing i need is the displacement for the subwoofer and ill add that into chamber 1 and were done 75 mdf wall dividing chamber 1 and 2 (so account for that) and place each 2 inch port one over the other height wise evenly spaced length wise between the two chambers this is for the interior portsġ2.6875(11/16) wide by 15.5 high by 23 deep=2.61753110532407 cf 277421875 is cf taken up in chamber 1 and 2Ģ4.00 wide by 15.5 high by 23 deep=4.9513888 cf this is the demensions of chamber 1 internal you must also add a. space needed in box size over the 7.00 cf target to account for all port displacements for each interior chamber with the ports evenly spaced between the two chambers) second chamber ported at 28.419 hz with 4 two inch id pvc ports 16.5 inches deep.
first chamber ported at 20.0954 hz with 4 two inch id pvc ports 16.5 inches deep.
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