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Message: <blockquote data-quote="Buck" data-source="post: 8001618" data-attributes="member: 591582">Round ports are more efficient than square/slot ports.  I'd say average slot port area is 10-16 in^2 per cube for daily, depending on tuning, power, box size, sub used, goal for the system, etc.Aero's I've done anywhere from 6-11 in^2, but you can do all the way up to the same amount as slot.  You can get away with roughly half the port area with an aero port as you can with a slot, and that's a big reason why a lot of people use them.  It saves space.  Plus they are easy to install.Any port inside or outside of the box doesn't change the style of the port, it just changes how much air inside the box it displaces.  A lot of external ports are in SPL so tuning can be changed easily, at least from what I've seen.</blockquote>

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