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<blockquote data-quote="1aespinoza" data-source="post: 8832919" data-attributes="member: 654802">From all I have read, watched, and discussed, a 40Hz box is going to be just that; a box with a resonant frequency of 40Hz. At that frequency is when that box will be loudest. For it to resonate at that frequency, it must have sub/s capable of making it resonate. For that reason a box is designed for the parameters of a sub. It is easier to build a box than a subwoofer (Although Sundown says they designed their subs to meet the box specs). &nbsp;Changes to box size, port length, or port area will change the Fs of a box. This is because the air inside a port is a &quot;weight&quot; that must be moved. So when you modify the port, you change the &quot;weight&quot; of the air inside it, thus changing the Fs of the box. &nbsp;Now there is the question of the type of car it will go into. The vehicle is basically another box in which the sub box will go into. I think that is like a 6th order box, not sure. That is the gist of it, although there is alot more to designing boxes. It is an art in itself and I am on the outside looking in.</blockquote>

[QUOTE="1aespinoza, post: 8832919, member: 654802"] From all I have read, watched, and discussed, a 40Hz box is going to be just that; a box with a resonant frequency of 40Hz. At that frequency is when that box will be loudest. For it to resonate at that frequency, it must have sub/s capable of making it resonate. For that reason a box is designed for the parameters of a sub. It is easier to build a box than a subwoofer (Although Sundown says they designed their subs to meet the box specs). Changes to box size, port length, or port area will change the Fs of a box. This is because the air inside a port is a "weight" that must be moved. So when you modify the port, you change the "weight" of the air inside it, thus changing the Fs of the box. Now there is the question of the type of car it will go into. The vehicle is basically another box in which the sub box will go into. I think that is like a 6th order box, not sure. That is the gist of it, although there is alot more to designing boxes. It is an art in itself and I am on the outside looking in. [/QUOTE]

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