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need help building a subwoofer box for my subs
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<blockquote data-quote="Doxquzme" data-source="post: 8866920" data-attributes="member: 689267"><p>Let me make it clear as mud...</p><p></p><p>While making an enclosure with no parallel sides is possible, it's very difficult for the home constructor making only a pair of enclosures. The vast majority of speakers use conventional parallel sides, front and back, top and bottom. This can still produce a very good box, but there is one thing that can make it 'better'.</p><p></p><p>There's something known as the 'Golden Ratio', signified by the Greek letter φ (Phi). There are many claims as to its inherent advantages (including aesthetics), but it does have an important characteristic ... no side is a multiple or sub-multiple of any other, so a box using the golden ratio cannot set up single-frequency standing waves across more than two panels. The ratio is defined as ...</p><p></p><p></p><p>For example, if the baffle is 400mm high, the width (or depth) should be 247mm, with the remaining dimension being 153mm. Note that these are all <em>inside</em> dimensions. These dimensions are not harmonically related, so there is less chance of reinforcement of particular frequencies or overtones. In reality, it probably doesn't make a great deal of difference one way or another, and it's just as easy to build a box using the 'golden ratio' that sounds bad as any other box shape (excluding a perfect cube with the driver smack in the centre of one face of course [ATTACH=full]55562[/ATTACH] ).</p><p></p><p>The ratio can also be described as 0.618 : 1 : 1.618. Which side you choose for the baffle is largely irrelevant, but ideally it would be the narrowest side (so for the example above, the baffle would be 400mm high by 153mm wide (internal). However, this does limit the size of speaker that can be mounted on the baffle - typically to no more than 150mm (6"). If the enclosure has a sub-enclosure (for a midrange driver for example), the problem gets a bit harder. There are probably far more commercial speaker boxes that <em>don't</em> use the golden ratio than there are that do, so to some extent it's always going to be a moot point.</p><p></p><p>[ATTACH=full]55563[/ATTACH]</p><p></p><p>Now that it is perfectly clear, don't worry about it!</p><p></p><p><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite17" alt=":LOL:" title="Laugh :LOL:" loading="lazy" data-shortname=":LOL:" /></p></blockquote><p></p>
[QUOTE="Doxquzme, post: 8866920, member: 689267"] Let me make it clear as mud... While making an enclosure with no parallel sides is possible, it's very difficult for the home constructor making only a pair of enclosures. The vast majority of speakers use conventional parallel sides, front and back, top and bottom. This can still produce a very good box, but there is one thing that can make it 'better'. There's something known as the 'Golden Ratio', signified by the Greek letter φ (Phi). There are many claims as to its inherent advantages (including aesthetics), but it does have an important characteristic ... no side is a multiple or sub-multiple of any other, so a box using the golden ratio cannot set up single-frequency standing waves across more than two panels. The ratio is defined as ... For example, if the baffle is 400mm high, the width (or depth) should be 247mm, with the remaining dimension being 153mm. Note that these are all [I]inside[/I] dimensions. These dimensions are not harmonically related, so there is less chance of reinforcement of particular frequencies or overtones. In reality, it probably doesn't make a great deal of difference one way or another, and it's just as easy to build a box using the 'golden ratio' that sounds bad as any other box shape (excluding a perfect cube with the driver smack in the centre of one face of course [ATTACH=full]55562[/ATTACH] ). The ratio can also be described as 0.618 : 1 : 1.618. Which side you choose for the baffle is largely irrelevant, but ideally it would be the narrowest side (so for the example above, the baffle would be 400mm high by 153mm wide (internal). However, this does limit the size of speaker that can be mounted on the baffle - typically to no more than 150mm (6"). If the enclosure has a sub-enclosure (for a midrange driver for example), the problem gets a bit harder. There are probably far more commercial speaker boxes that [I]don't[/I] use the golden ratio than there are that do, so to some extent it's always going to be a moot point. [ATTACH type="full" alt="Figure 3.1"]55563[/ATTACH] Now that it is perfectly clear, don't worry about it! :LOL: [/QUOTE]
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need help building a subwoofer box for my subs
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