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Old 03-26-2013, 06:24 PM
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Default 4th order for 2 OA 18's

Im looking to wall off the back of my car and put a 4th order with 2 Obsidian Audio 18's. I am planning on doing 9 cubic feet sealed and around 22.5 cubic feet ported. this will give me a 2.5:1 ratio. << is that good?

I have been looking around at some 4th order programs and im just not sure what to believe. I know that I need to find the resonant frequency of the sealed part and tune the port to that frequency but im not exactly sure how to find that.

If anyone can help or chime in it would be greatly appreciated. Thanks
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Old 03-26-2013, 06:27 PM
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2.5 each sealed i beleieve. 9 is wayy too much msg hackmunch about 4th for oa's
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Sometimes I just want to drive my shit into a shop and hand them a fistful of money and be like... "Here. Do this shit."
I have zero problems with people having a shop or other enthusiast do their build. But it's a little disrespectful they take credit for it and/or don't correct people when they assume the owner did the work. Happens all the time.
4 zv4 18:2 ct7k: c pillar wall(not sealed off)156.11:
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Old 03-26-2013, 06:29 PM
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ya but on their website it recommends 3.5-5 for a sealed? or is it completely different for 4th order? sorry this will be my first 4th order
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Old 03-26-2013, 06:33 PM
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And I believe I sent him a message the other day and haven't heard back
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Old 03-26-2013, 06:40 PM
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or read the 4th order thread fully i do beleive i asked about the oa 18's as i used to have a couple
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Sometimes I just want to drive my shit into a shop and hand them a fistful of money and be like... "Here. Do this shit."
I have zero problems with people having a shop or other enthusiast do their build. But it's a little disrespectful they take credit for it and/or don't correct people when they assume the owner did the work. Happens all the time.
4 zv4 18:2 ct7k: c pillar wall(not sealed off)156.11:
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Old 03-26-2013, 06:43 PM
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You can get away with less sealed volume on the sealed half of a 4th order than you can in just a standard sealed box. Also adding polyfill in the sealed chamber will help save space by making the sealed side seem/act larger.

You will be able to get 3:1 or higher ratio easy if you have 30+ cubes to work with. 9 cubes sealed is way too big IMO.
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