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<blockquote data-quote="metalheadjoe" data-source="post: 8794059" data-attributes="member: 581422">I think OP wants a little more in-depth answer than the first few responses provided. I&#039;ve also never understood the benefits of a 4th order.Sealed boxes limit cone movement via unequal pressure inside and outside the box. There is no cancellation because the inside and outside pressures are separated. Makes sense.Ported boxes add additional output over sealed boxes because they are tuned to a frequency where the air movement through the port aligns with the air movement from the cone. Makes sense.Question is, what benefit does a 4th order have over a ported box? Seems like it combines the worst aspects of a sealed and ported box. Cone movement is limited more than in a sealed box by negative pressure in the sealed side and positive pressure in ported side, and you don&#039;t gain output like a ported box because the port is the only avenue for air to travel.What am I missing?</blockquote>

[QUOTE="metalheadjoe, post: 8794059, member: 581422"] I think OP wants a little more in-depth answer than the first few responses provided. I've also never understood the benefits of a 4th order. Sealed boxes limit cone movement via unequal pressure inside and outside the box. There is no cancellation because the inside and outside pressures are separated. Makes sense. Ported boxes add additional output over sealed boxes because they are tuned to a frequency where the air movement through the port aligns with the air movement from the cone. Makes sense. Question is, what benefit does a 4th order have over a ported box? Seems like it combines the worst aspects of a sealed and ported box. Cone movement is limited more than in a sealed box by negative pressure in the sealed side and positive pressure in ported side, and you don't gain output like a ported box because the port is the only avenue for air to travel. What am I missing? [/QUOTE]

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