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port direction truck box


thefatkid

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got my subs figured out, 4 sundown ev3 10s. going ported they will be downfire in the truck but currently i have the port on my alpines facing downward and i have the subs chambered seperately. from reading on these forums i see a common box is best and the ports firing too close to a floor or wall is not the best idea. if i fire the port down again ill only have 3 inches of room before its at the floor or i can port up towards the roof, does this rough police sketch look like it would work? box is 4 cubes, im coming up with a 1"x30"x15.25" slot port for 32 hz. / if it matters ill have 2500 rms to the subs. 
would firing the port up sound or play differently than down ?

thanks again for all yalls help. 

Josh

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If you have clearance to the side you can port sideways, passenger side usually work, on your port, you need to be aware of 1) correct port area, 2)correct port area ratio, 3) keep the port inner end reasonably away from the subs.

Your port area ratio is 30:1 and should be kept like 6:1, you have 30 square inches of port area total and sundown wants 16 square inches per driver or about 64 square inches total.

Just a few things to bear in mind.

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thanks joe,

i did a port calculator online and it gave me that size at 32hz. but it was based off just box volume. i did it off 4 cubes which is what sundown is asking for on 4 10s. if my drawing is correct on length of port im looking at subs being 6" depth and then port would be on back wall about 7 inches above their magnets. on the sides of the box it fits tight against the sides of the truck. theres a small amount of room but not even a fingers worth. i have them down currently but its about 3 inches off the floor of the truck where it vents to. 

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That last port design i wouldnt recommend, as a 180° bend in the port will increase resistance in flow and cause loss of output

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i think im starting to see the light. lol.

so now that i understand ports a little better. sundown is asking for 64 sq in. of port for my 4 subs. heres what im down to to get my port ratio better, i can do a 4.5 x 15 x 30 (67.5sqin) but ill have to put a 90 in it to get the length. the other route is a 3.5x18x26 (63sqin). my only thing is that ive been reading that the port too close to the sub is bad? either route i take the port will end up being 2" away from my subs but if i dont space them evenly and i put a pair far left and a pair far right then the port would sit between them and not necessarily on top of them. 

also if they are asking for 64sqin of port area is it going to kill it if i went with 67 or 63 ? would the port forward at the dash right in between my seats be preferable or towards the roof ?

4 cubic ft, tuned to 32 hz.

(measurements on paper are incorrect) for port shape only. 

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