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Having trouble finding sealed enclosure for my two SWS-12d2... Please Help
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<blockquote data-quote="zako" data-source="post: 8210225" data-attributes="member: 629735"><p>Getting the sealed box size off by 10-20% is not a big deal. Besides the box volume, you want to get a box with thicker MDF material. For prefab boxes, the best you can have is usually 3/4 inch MDF, but there are a lot using cheaper thinner MDF.</p><p></p><p>However, I must say that Alpine's sealed box recommendation is not optimal for the 12 inch SWS models. The rule of thumb is to set the box volume to get the box qtc as close as possible to 0.7, which results in the best tradeoff between low end extension, power handling, and transient response. Getting it off by a little from 0.7 is not a big deal. The problem with Alpine's SWS sub is that in a 1cu ft box, its qtc is like 1, which is considered way off by some. They list the qtc value in the manual for each box. To get the qtc under 0.8 with the 12 inch SWS sub, you need like a 2cu ft box according to the box modeling software. An Alpine engineer mentioned that they aimed for a high qtc setup to provide a stronger thump appreciated by some car audio enthusiasts, which however, does not explain why the 10 inch and 15 inch SWS subs have a more reasonable qtc in the recommended boxes.</p><p></p><p>Anyways, just get the box that's most convenient to you. Try to stuff it with polyfill. The rule is thumb is that stuffing up to 1.5 pounds of polyfill for each cu ft of space can increase the apparent box volume by up to 30% and lower the box qtc. If you haven't bought the subs yet, consider just one 15 inch SWS if you can fit the box. They're considered to be the gems of the SWS lineup. People have got phenomenally good sound with 2 15 inch SWS each in 2cu ft box.</p></blockquote><p></p>
[QUOTE="zako, post: 8210225, member: 629735"] Getting the sealed box size off by 10-20% is not a big deal. Besides the box volume, you want to get a box with thicker MDF material. For prefab boxes, the best you can have is usually 3/4 inch MDF, but there are a lot using cheaper thinner MDF. However, I must say that Alpine's sealed box recommendation is not optimal for the 12 inch SWS models. The rule of thumb is to set the box volume to get the box qtc as close as possible to 0.7, which results in the best tradeoff between low end extension, power handling, and transient response. Getting it off by a little from 0.7 is not a big deal. The problem with Alpine's SWS sub is that in a 1cu ft box, its qtc is like 1, which is considered way off by some. They list the qtc value in the manual for each box. To get the qtc under 0.8 with the 12 inch SWS sub, you need like a 2cu ft box according to the box modeling software. An Alpine engineer mentioned that they aimed for a high qtc setup to provide a stronger thump appreciated by some car audio enthusiasts, which however, does not explain why the 10 inch and 15 inch SWS subs have a more reasonable qtc in the recommended boxes. Anyways, just get the box that's most convenient to you. Try to stuff it with polyfill. The rule is thumb is that stuffing up to 1.5 pounds of polyfill for each cu ft of space can increase the apparent box volume by up to 30% and lower the box qtc. If you haven't bought the subs yet, consider just one 15 inch SWS if you can fit the box. They're considered to be the gems of the SWS lineup. People have got phenomenally good sound with 2 15 inch SWS each in 2cu ft box. [/QUOTE]
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Having trouble finding sealed enclosure for my two SWS-12d2... Please Help
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