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Message: <blockquote data-quote="Kangaroux" data-source="post: 8307406" data-attributes="member: 628495">For my obsidian OA-12 I did 1 cube sealed / 2.5 ported, and that's net volume which includes space for the sub and the port. The port was about 45 in^2 and tuned to 40hz. If 32 is the lowest you want to go you can tune it to about 45hz, though don't tune it too high because your low end will drop off pretty steep.I suggest getting an 8" sonotube/concrete form from home depot/lowes and using that as your port. That's 50 in^2 and you can make a large port to start out with and keep cutting it down until you get a sound that is good. If you go this route, just note that if you don't attach some sort of flare to the end of the sonotube you will get a lot of noise from the high velocity air not having a smooth entrance/exit.</blockquote>

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