Originally Posted by DavidK442
Actual in room measurements...YES!
I am surprised that the sealed has such a flat response across the sub-bass range. Yeah room gain! Still, giving up 6db in the lowest octaves seems like a big deal. If you don't need the extra output though I can see the allure of the smaller, simpler sealed build.
it would seem so on the surface but there is a lot more that needs to be taken into consideration.
at max output, the ported sub will have over excursion and that can lead to trouble.
so, you have to add a high pass filter, which means several things
a. you have to have a way to add a high pass filter. most AVRs cannot do this so the ported sub needs dsp of some kind
b. adding the filter removes some or your gains and further kills any hope of output below the tuning point
c. adding that filter raises the group delay to high heaven
in addition, in the box sizes that have been mentioned here, to keep the port velocity low enough, at 4 cu ft and max output, you would need 2x 4" ports at 37.87" each, or 3x 3" ports at 32.22" each(assumed 20hz tune). the ports probably wont even fit in the box.
so you are absolutely right that sealed is a lot simpler