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<blockquote data-quote="Seraphim38" data-source="post: 8418780" data-attributes="member: 638571">another online calculator that works well, since the link above doesn&#039;t work.&nbsp; This is the one I like to use.<a href="http://www.bcae1.com/spboxnew2.htm" target="_blank">Speaker Enclosure Volume Calculator</a>Confirmed; for 3.4 cubes you can use two 4&quot; aero ports at 16.4 inches in length to get you to 33Hz.&nbsp; Note, this is only 25 cubic inches of port area and you would be better if that was 30 inches or more.&nbsp; One 6&quot; diameter at 18 inches long would get you 28 cubic inches of port area at the same frequency.&nbsp; Three 4&quot; ports or two 6&quot; ports both put you into ports that are likely too long to be practical.As described above, for low end extension/performance a larger box would be preferable, but then your issue with the port surface area becomes worse.&nbsp; But, on the good side, your port lengths will decrease for the same tuning.</blockquote>

[QUOTE="Seraphim38, post: 8418780, member: 638571"] another online calculator that works well, since the link above doesn't work. This is the one I like to use. [URL="http://www.bcae1.com/spboxnew2.htm"]Speaker Enclosure Volume Calculator[/URL] Confirmed; for 3.4 cubes you can use two 4" aero ports at 16.4 inches in length to get you to 33Hz. Note, this is only 25 cubic inches of port area and you would be better if that was 30 inches or more. One 6" diameter at 18 inches long would get you 28 cubic inches of port area at the same frequency. Three 4" ports or two 6" ports both put you into ports that are likely too long to be practical. As described above, for low end extension/performance a larger box would be preferable, but then your issue with the port surface area becomes worse. But, on the good side, your port lengths will decrease for the same tuning. [/QUOTE]

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