Quote:
Mike P. wrote:
 cixelsid wrote:
Yes there are issues when the end of the port is 5' or more away from the driver.
Brent, from what I've read, there is the a possibility of a standing wave forming in the 90-110hz range if the sub is taller then 5 feet. Here's a link. Scroll to the bottom of the page. http://dustin.bunnyhug.net/sonostart.php |
I was questioning the statement that the port opening needs to be within 5' of the driver.
Port lengths that support a resonant frequency within or near the passband of the subwoofer is a whole different animal. WinISD and Unibox both calculate the first pipe resonance for you for this reason. I think the recommendation is to get the first resonsonance frequency above 200hz...obviously the higher the better.
-Brent