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<blockquote data-quote="helotaxi" data-source="post: 377558" data-attributes="member: 550915">Having less than the diameter of the port for clearance will affect tuning and performance.&nbsp; You should plan for at least 4&quot;, but more is better.If the port is inside the box, it displaces its volume from the effective volume of the box.It depends on the size of the box and the type of sub and amount of power you will be running.&nbsp; Bigger box needs more bracing.&nbsp; More powerful sub with more power needs more bracing.&nbsp; The divider between the chambers is a very good brace and adds a lot of strength to the box.It will work, assuming that 4&quot; will be big enough to minimize port turbulence for the sub you are using.&nbsp; The larger the excursion of the sub, the more air has to move through the port.&nbsp; As you decrease the amount of area that the air has to travel through, the air starts to compress and cause turbulence and noise.To build a slot port, figure the area of the round port that you planned for and make a rectangle with the same area.&nbsp; You can use the edge of the enclosure for one side of the port which makes the construction easier.&nbsp; Several websites have tutorials or diagrams that show you how it looks.&nbsp; That will make it easier to visualze, just adjust the dimensions to suit your application.</blockquote>

[QUOTE="helotaxi, post: 377558, member: 550915"] Having less than the diameter of the port for clearance will affect tuning and performance. You should plan for at least 4", but more is better. If the port is inside the box, it displaces its volume from the effective volume of the box. It depends on the size of the box and the type of sub and amount of power you will be running. Bigger box needs more bracing. More powerful sub with more power needs more bracing. The divider between the chambers is a very good brace and adds a lot of strength to the box. It will work, assuming that 4" will be big enough to minimize port turbulence for the sub you are using. The larger the excursion of the sub, the more air has to move through the port. As you decrease the amount of area that the air has to travel through, the air starts to compress and cause turbulence and noise. To build a slot port, figure the area of the round port that you planned for and make a rectangle with the same area. You can use the edge of the enclosure for one side of the port which makes the construction easier. Several websites have tutorials or diagrams that show you how it looks. That will make it easier to visualze, just adjust the dimensions to suit your application. [/QUOTE]

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