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General Car Audio
New build. :) memphis mojo 15
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<blockquote data-quote="THATpurpleKUSH" data-source="post: 7447771" data-attributes="member: 615398"><p>I say this based on my experience building boxes and from what I have seen others do. On a higher excursion woofer (xmax &gt; ~15mm) a bigger port will help to increase the amount of air moved. When doing a slot port you should aim for 12-16sq in per cu/ft of airspace. A woofer like yours would be towards the upper end of that. It looks like your box is somewhere in the 3.0-3.5cu/ft range so assuming that on the low end of that figure you should have 36-48sq in and the upper end would be 42-56sq in. By having a small port you are more at risk for port noise (whistling or chuffing) because of the higher air velocity, especially if you have hard edges at the port openings.</p><p></p><p>I like to go excess with bracing because the box can never be too strong imo. I use 2x2 or 1.5in dowls. The 2x2s are cheaper but take up more airspace.</p><p></p><p>Some examples of how I have done it:</p><p></p><p><img src="http://carphotos.cardomain.com/ride_images/3/109/1749/25270874025_medium.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="http://carphotos.cardomain.com/ride_images/3/109/1749/25270874017_medium.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="http://carphotos.cardomain.com/ride_images/3/109/1749/25270874034_medium.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>and when you add bracing you need to subtract its displacement or it will throw off tuning.</p></blockquote><p></p>
[QUOTE="THATpurpleKUSH, post: 7447771, member: 615398"] I say this based on my experience building boxes and from what I have seen others do. On a higher excursion woofer (xmax > ~15mm) a bigger port will help to increase the amount of air moved. When doing a slot port you should aim for 12-16sq in per cu/ft of airspace. A woofer like yours would be towards the upper end of that. It looks like your box is somewhere in the 3.0-3.5cu/ft range so assuming that on the low end of that figure you should have 36-48sq in and the upper end would be 42-56sq in. By having a small port you are more at risk for port noise (whistling or chuffing) because of the higher air velocity, especially if you have hard edges at the port openings. I like to go excess with bracing because the box can never be too strong imo. I use 2x2 or 1.5in dowls. The 2x2s are cheaper but take up more airspace. Some examples of how I have done it: [IMG]http://carphotos.cardomain.com/ride_images/3/109/1749/25270874025_medium.jpg[/IMG] [IMG]http://carphotos.cardomain.com/ride_images/3/109/1749/25270874017_medium.jpg[/IMG] [IMG]http://carphotos.cardomain.com/ride_images/3/109/1749/25270874034_medium.jpg[/IMG] and when you add bracing you need to subtract its displacement or it will throw off tuning. [/QUOTE]
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