View Full Version : port size for 12" sub
08-04-2003, 03:57 PM
Does anybody know how long my 4" port needs to be.
Here are my specs
Box Size 1.92 Cubic Feet
Any suggestions would be great. Thanks
08-04-2003, 04:13 PM
The length of the port depends on what freq you want the box tuned at.
For more SQ try tuning lower.
28Hz would require the port to be about 20" long.
For more SPL try tuning higher
33Hz would require the port to be about 13.5" long
You could tune even higher for increased SPL. But you would really start to lose SQ. Your low end response would start to disappear with a high tuned box.
It all really just depends on what kind of sound your looking for.