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<blockquote data-quote="Electrodynamic" data-source="post: 7635892" data-attributes="member: 548723"><p>Short stroke does not lower Qts just as high stroke does not always mean low motor force with high Qts.</p><p></p><p></p><p>To those of you looking at the post I am quoting above, please do not look at it as everything contained in the paragraph above is false if you are looking for information on car audio subwoofers. Jim is right - motor force is <em>not</em> the most important thing to look at! With small signal parameters high BL can be achieved in multiple ways. However, a very strong motor is not desired and/or wanted depending on the application. For instance, you can easily over-motor a driver to be used in sealed applications. The result will be a driver that has an F3 of 65 Hz in the target size enclosure...aka it won't play low. Will it be loud at 70 or 80 Hz? It could, but it will also have such anemic bottom end that almost 100% of customers will hate it.</p><p></p><p>And a more compliant (or "looser") suspension will result in a <strong>lower</strong> Fs.</p><p></p><p></p><p>"Tighten"ing the suspension, or making it less compliant, will change the Qt more than any effects of adding mass will have on the suspension. That is, of course, unless you're talking about increasing the moving mass by 2x with a compliant suspension to begin with [note that is a LOT of mass - as in going from an Mms of 250g to 500g!]. Everything is within limits, not definite.</p><p></p><p></p><p>Once again this is wrong.</p><p></p><p></p><p>Loudspeaker design is all about compromises. And have you ever seen a neo motor? They are tiny in comparison yet still offer very solid motor force. The size of a motor is NOT an indicator of how well the driver will perform in every application. Know and understand what you want and go from there. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif</p></blockquote><p></p>
[QUOTE="Electrodynamic, post: 7635892, member: 548723"] Short stroke does not lower Qts just as high stroke does not always mean low motor force with high Qts. To those of you looking at the post I am quoting above, please do not look at it as everything contained in the paragraph above is false if you are looking for information on car audio subwoofers. Jim is right - motor force is [I]not[/I] the most important thing to look at! With small signal parameters high BL can be achieved in multiple ways. However, a very strong motor is not desired and/or wanted depending on the application. For instance, you can easily over-motor a driver to be used in sealed applications. The result will be a driver that has an F3 of 65 Hz in the target size enclosure...aka it won't play low. Will it be loud at 70 or 80 Hz? It could, but it will also have such anemic bottom end that almost 100% of customers will hate it. And a more compliant (or "looser") suspension will result in a [B]lower[/B] Fs. "Tighten"ing the suspension, or making it less compliant, will change the Qt more than any effects of adding mass will have on the suspension. That is, of course, unless you're talking about increasing the moving mass by 2x with a compliant suspension to begin with [note that is a LOT of mass - as in going from an Mms of 250g to 500g!]. Everything is within limits, not definite. Once again this is wrong. Loudspeaker design is all about compromises. And have you ever seen a neo motor? They are tiny in comparison yet still offer very solid motor force. The size of a motor is NOT an indicator of how well the driver will perform in every application. Know and understand what you want and go from there. [IMG]//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif[/IMG] [/QUOTE]
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