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Looking to port my box (I think)
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<blockquote data-quote="Che&amp;#1071;RyMan" data-source="post: 8372411" data-attributes="member: 662580"><p>Im building a box for another member now and he called me Friday with a concern of a 1.5" protrusion in the rear firewall that would partially block the port. The configuration of the enclosure could not be changed but if I take advantage of the area in the wedge I can move the port over another .75 plus the rear wall thickness of .75" Im now even with the protrusion. All you need is a side view drawing</p><p></p><p>and draw rectangles and match the area. The first drawing shows you the original design easy to build a 4.75" x 5.5" port = 26sq"</p><p></p><p>The second drawing shows the port moved over .75" and double back wall thats even with protrusion so first draw a rectangle and calculate the volume 4.3 x 5.68=24.4sq" Draw another rectangle in the wedge its 1.3" x 4.3 = 5.59 but divide this number in half to find the volume of a wedge is 2.8" add 2.8 +24.4= 27sq" the new irregular port and original square port are now matched close enough and the port is unobstructed.[ATTACH]26552010[/ATTACH] Josh's original box builder made the mistake of calculating a 6inch port in a calculator but used two 3 inch ports to substitute and Josh was experiencing huffing port noises. After talking with him I modeled his box and confirmed the noises were from the port. On a smaller amp the vent velocity would have gone unnoticed.</p></blockquote><p></p>
[QUOTE="CheЯRyMan, post: 8372411, member: 662580"] Im building a box for another member now and he called me Friday with a concern of a 1.5" protrusion in the rear firewall that would partially block the port. The configuration of the enclosure could not be changed but if I take advantage of the area in the wedge I can move the port over another .75 plus the rear wall thickness of .75" Im now even with the protrusion. All you need is a side view drawing and draw rectangles and match the area. The first drawing shows you the original design easy to build a 4.75" x 5.5" port = 26sq" The second drawing shows the port moved over .75" and double back wall thats even with protrusion so first draw a rectangle and calculate the volume 4.3 x 5.68=24.4sq" Draw another rectangle in the wedge its 1.3" x 4.3 = 5.59 but divide this number in half to find the volume of a wedge is 2.8" add 2.8 +24.4= 27sq" the new irregular port and original square port are now matched close enough and the port is unobstructed.[ATTACH=CONFIG]26552010[/ATTACH] Josh's original box builder made the mistake of calculating a 6inch port in a calculator but used two 3 inch ports to substitute and Josh was experiencing huffing port noises. After talking with him I modeled his box and confirmed the noises were from the port. On a smaller amp the vent velocity would have gone unnoticed. [/QUOTE]
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Looking to port my box (I think)
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