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361 Posts
OK, may I have a fresh start?
So I played with WinISD. I know, I didn't account for in-car effects. Please bear/bare with me? There is no 22" Fi subwoofer. So I used a Maelstrom-X to simply model 4 things. Bare with me there as well?
1: (yellow) sealed in recommended
2: (red) sealed in max available space with my dimensions 48" X 32" X 24" for 18 cubes
3: (purple) vented recommended
4: (blue) vented 14 cubes 12Hz
1st pic:
FR curve... I was surprised that the recommended looks much more desirable for my personal tastes than the 14 cubes/12Hz I originally wanted. All the way down to 12Hz I am seeing more output. Sealed is not an option.
2nd pic:
Group Delay blue is obviously much better than purple.
3rd:
Port Gain shows that even with the super low tuning, the port helps all the way up to 65Hz. So huge super low tuned still has gain from the port over both .707 and super large sealed.
4th:
blue is obviously better on velocity
5th
SPL obviously much better ported than sealed, and recommended better than super large and low (purple better than blue)
6th
I sit corrected. I thought the blue would have better excursion control than sealed. It does not. BUT, I think when lowering power input so that output is the same.... it takes less power therefore still less excursion in the blue to be equal or better than sealed. If I were to put less signal power to the blue to make it match up with the sealed output, then cone excursion should still be superior large ported to both sealed enclosures.
So I played with WinISD. I know, I didn't account for in-car effects. Please bear/bare with me? There is no 22" Fi subwoofer. So I used a Maelstrom-X to simply model 4 things. Bare with me there as well?
1: (yellow) sealed in recommended
2: (red) sealed in max available space with my dimensions 48" X 32" X 24" for 18 cubes
3: (purple) vented recommended
4: (blue) vented 14 cubes 12Hz
1st pic:
FR curve... I was surprised that the recommended looks much more desirable for my personal tastes than the 14 cubes/12Hz I originally wanted. All the way down to 12Hz I am seeing more output. Sealed is not an option.
2nd pic:
Group Delay blue is obviously much better than purple.
3rd:
Port Gain shows that even with the super low tuning, the port helps all the way up to 65Hz. So huge super low tuned still has gain from the port over both .707 and super large sealed.
4th:
blue is obviously better on velocity
5th
SPL obviously much better ported than sealed, and recommended better than super large and low (purple better than blue)
6th
I sit corrected. I thought the blue would have better excursion control than sealed. It does not. BUT, I think when lowering power input so that output is the same.... it takes less power therefore still less excursion in the blue to be equal or better than sealed. If I were to put less signal power to the blue to make it match up with the sealed output, then cone excursion should still be superior large ported to both sealed enclosures.
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