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DIY For Audio
My subwoofer design methods and considerations
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<blockquote data-quote="Timber_MG" data-source="post: 164574" data-attributes="member: 18"><p>This will be a very nice build.</p><p></p><p></p><p></p><p>Ian, you're being very generous to that conventional driver being driven at 500W. Long coil/short gap drivers don't have much of an opportunity to transfer heat into the motor/basket assembly and thus cook quite nicely. Using high temperature formers and adhesives might increase power handling but it still leaves a hot winding behind that has significant compression. The result is significant compression even at power levels as low as -10 dB and a resultant shift in alignment.</p><p></p><p>The HE driver (appart from having a far better motor) has a long gap and only a slight overhang. This gives it a lower Xmax, but the cooling afforded by a tight gap tolerance and high gap height is far, far better and the extreme field density around the gap makes the driver behave reasonably well even over Xmax (you'l see 18sound add Hg/4 in their mathematical Xmax figure to arrive at those ~7mm)</p><p></p><p>In short, while the HE driver is still very comfortable at 100W for the calculated output the traditional subwoofer driver is already shifting its alignment and loosing sensitivity (500W is a lot of power, you'll likely start smelling it soon). In practice you hardly see an 18" driver move much at all for most of the time and when you do, other things around the house move along as well.</p></blockquote><p></p>
[QUOTE="Timber_MG, post: 164574, member: 18"] This will be a very nice build. Ian, you're being very generous to that conventional driver being driven at 500W. Long coil/short gap drivers don't have much of an opportunity to transfer heat into the motor/basket assembly and thus cook quite nicely. Using high temperature formers and adhesives might increase power handling but it still leaves a hot winding behind that has significant compression. The result is significant compression even at power levels as low as -10 dB and a resultant shift in alignment. The HE driver (appart from having a far better motor) has a long gap and only a slight overhang. This gives it a lower Xmax, but the cooling afforded by a tight gap tolerance and high gap height is far, far better and the extreme field density around the gap makes the driver behave reasonably well even over Xmax (you'l see 18sound add Hg/4 in their mathematical Xmax figure to arrive at those ~7mm) In short, while the HE driver is still very comfortable at 100W for the calculated output the traditional subwoofer driver is already shifting its alignment and loosing sensitivity (500W is a lot of power, you'll likely start smelling it soon). In practice you hardly see an 18" driver move much at all for most of the time and when you do, other things around the house move along as well. [/QUOTE]
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DIY & Tutorials
DIY For Audio
My subwoofer design methods and considerations
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