PDA

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