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Low Earth Orbit
DIY Audio
New DIY Mid High (90deg) - AKA PM90
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<blockquote data-quote="Art Welter" data-source="post: 137357" data-attributes="member: 52"><p>Re: New DIY Mid High</p><p></p><p></p><p>Jack,</p><p></p><p>Hidden, and pretty small ;^). The ribbed portion of the diaphragm probably is only contributing 50% to Sd.</p><p></p><p>Xmax on virtually all HF compression drivers is about the same, the winner in output is the driver with more Sd (cone/diaphragm) area, even with HF there is no replacement for displacement. </p><p></p><p>Smaller moving mass is a good thing from a distortion standpoint, a 4" diaphragm is too big (IMO) for clean HF reproduction, but a 3" diaphragm is OK, at least to my old ears. </p><p></p><p>If you compare Sd of a 3" dome diaphragm (easy to figure at PI r/squared) to the Sd of the annular ring diaphragms you can see why JBL "doubled up" on their D2, rather than use two diaphragms covering different frequency ranges.</p><p></p><p>Art</p></blockquote><p></p>
[QUOTE="Art Welter, post: 137357, member: 52"] Re: New DIY Mid High Jack, Hidden, and pretty small ;^). The ribbed portion of the diaphragm probably is only contributing 50% to Sd. Xmax on virtually all HF compression drivers is about the same, the winner in output is the driver with more Sd (cone/diaphragm) area, even with HF there is no replacement for displacement. Smaller moving mass is a good thing from a distortion standpoint, a 4" diaphragm is too big (IMO) for clean HF reproduction, but a 3" diaphragm is OK, at least to my old ears. If you compare Sd of a 3" dome diaphragm (easy to figure at PI r/squared) to the Sd of the annular ring diaphragms you can see why JBL "doubled up" on their D2, rather than use two diaphragms covering different frequency ranges. Art [/QUOTE]
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New DIY Mid High (90deg) - AKA PM90
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