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Enclosure Design & Construction
PORT QUESTIONS Truck center console w/ dual opposed 12” NVX 20-25hz
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<blockquote data-quote="winkychevelle" data-source="post: 8823988" data-attributes="member: 611804"><p>I would not tune below 28hz even to get stupid low. Remember the lower you tune the more you give up higher. And door speakers can sometimes play to 60hz but it's more likely the 80hz will be their limit. Tuning so low will likely make you drop off around 50hz and you are likely to be around the same volume or lower considering the loss at higher frequency. But I think it will work out ok.</p><p></p><p>And yea sound cancellation is always possible it's the primary reason door speakers struggle at 60hz the distance between the speakers in most cars lines up nearly perfectly to be 180° out of phase around 60hz.</p><p></p><p>This distance increases the lower the freequency so you may find cancellation in the sub range considering the nearly doubled distance between the sub cones. This is frequency dependant so it won't be total cancellation. </p><p></p><p>7in² per cube is the minimum I would go I ran both a single 6inch and dual 4 inch in a 3ft³ box with good results but that's the minimum I would go without fear of port noise.</p><p></p><p>Port location shouldnt matter much, but it at least in my thought process, I haven't tested it out personally, shouldn't be 180° opposite the speaker cone for the same issues of cancellation. </p><p></p><p>I do know that some competition style boxs are sub and port opposite but they are playing a very narrow frequency range where cancellation is less of an issue. </p><p></p><p>Personally I'd face the subs up or down and port to the front or rear.</p></blockquote><p></p>
[QUOTE="winkychevelle, post: 8823988, member: 611804"] I would not tune below 28hz even to get stupid low. Remember the lower you tune the more you give up higher. And door speakers can sometimes play to 60hz but it's more likely the 80hz will be their limit. Tuning so low will likely make you drop off around 50hz and you are likely to be around the same volume or lower considering the loss at higher frequency. But I think it will work out ok. And yea sound cancellation is always possible it's the primary reason door speakers struggle at 60hz the distance between the speakers in most cars lines up nearly perfectly to be 180° out of phase around 60hz. This distance increases the lower the freequency so you may find cancellation in the sub range considering the nearly doubled distance between the sub cones. This is frequency dependant so it won't be total cancellation. 7in² per cube is the minimum I would go I ran both a single 6inch and dual 4 inch in a 3ft³ box with good results but that's the minimum I would go without fear of port noise. Port location shouldnt matter much, but it at least in my thought process, I haven't tested it out personally, shouldn't be 180° opposite the speaker cone for the same issues of cancellation. I do know that some competition style boxs are sub and port opposite but they are playing a very narrow frequency range where cancellation is less of an issue. Personally I'd face the subs up or down and port to the front or rear. [/QUOTE]
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PORT QUESTIONS Truck center console w/ dual opposed 12” NVX 20-25hz
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