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  ติดต่อลงโฆษณา [email protected] หรือโทร. 081-811-1138 หรืออ่านรายละเอียดเพิ่มเติม คลิกที่นี่

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<p>[QUOTE=&quot;zenon_pub, post: 201101, member: 42554&quot;]for ported box designs using a slot port, there is &#039;1&#039; general rule to follow.</p><p><br /></p><p>14&quot;-16&quot; of port area for every &#039;1&#039; cubic foot of box space, the length has to be adjusted for the type of music....but the port lengths are usually around 16&quot;- 24&quot;</p><p><br /></p><p><br /></p><p><b>the bigger the port area the longer the port has to be </b></p><p><br /></p><p><b>the smaller the box the longer the port has to be</b></p><p><br /></p><p><b>box space is calculated by the interior dimensions</b></p><p><br /></p><p><b>the shorter the port length the higher the tuning frequency</b></p><p><br /></p><p><b>the longer the port length the lower the tuning frequency</b> </p><p><br /></p><p><b>expensive brands are not always better than cheap brands</b></p><p><br /></p><p><b> port length must be adjusted to the customers taste in music</b></p><p>---------------------------------------------------------------------</p><p>so a&nbsp; 2 cubic foot box would need 28&quot;-32&quot; of port area</p><p>the port area is calculated by the [width x height ]of the port opening.</p><p><br /></p><p>28&quot; = 7 x4 .....or .....2 x 14.... or .....3.5 x 8....or....6 x 4.666</p><p>(whatever it takes to get 28&quot; or 32&quot;)</p><p><br /></p><p>the interior box space is calculated by&nbsp;&nbsp; [width x height x length / 1728] = V</p><p><br /></p><p>1726=12 x 12 x 12 {equals 1 cubic foot}</p><p>V = interior box space</p><p><br /></p><p>if the port area was 32&quot; it would have to be longer than the port area with 28&quot;</p><p><br /></p><p>if the port legth is too long the tuning will be too low and there would be no benefit with using a ported box, so you might as well go sealed.</p><p><br /></p><p>a tuning frequency between 32hz -45hz is what is usually desired.</p><p>if you follow the above formula, it will put you in this frequency range.... try and keep port length between 16&quot;-26&quot;</p><p>--------------------------------------------------------------------------</p><p><br /></p><p>SuperSound</p><p>086-977-4077[/QUOTE]</p><p><br /></p>

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