View Full Version : tuning for 40 hz w. 4 1508's

thur5d4yf4n

11-26-2007, 11:13 AM

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.

duece212

11-26-2007, 11:16 AM

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

thur5d4yf4n

11-26-2007, 11:19 AM

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

duece212

11-26-2007, 11:24 AM

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

pi x radius squared

DBfan187

11-26-2007, 11:25 AM

pi*R^2

thur5d4yf4n

11-27-2007, 01:05 AM

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