tuning for 40 hz w. 4 1508's

[thur5d4yf4n 10+ year member]

im going to order 4 1508's for my truck. how should I tune it using round ports, im not sure how many I should use, I have a ton of 4" diameter tube laying around. I know how to calculate the length for 40 hz im just not sure how many ports is best to use for enough port area.

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[duece212 5,000+ posts]

http://www.ddaudio.com/dd/caraudio/enclosureInfo/BoxSizesHiEff.asp

 

[thur5d4yf4n 10+ year member]

how do i calculate the port area of a 4" diameter pipe?

 

[duece212 5,000+ posts]

how do i calculate the port area of a 4" diameter pipe?

pi x radius squared

 

[DBfan187 5,000+ posts]

pi*R^2

 

[thur5d4yf4n 10+ year member]

does anyone have amp recommendations on what I should use to power these