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Subwoofers
why dont subwoofers....
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<blockquote data-quote="squeak9798" data-source="post: 6035272" data-attributes="member: 555320"><p>Xmax is dependent upon the geometry of the coil and the gap and control of the magnetic flux within the gap. In an overhung motor a taller topplate requires a longer coil to maintain the same amount of Xmax. Taller is not necessarily better as far as the coil is concerned as there are trade-offs here (higher inductance, more mass, etc).</p><p></p><p>Having a bumped backplate/etc may give the coil more travel before damage occurs (Xmech), but it won't change the amount of <em>linear</em> stroke the driver is capable of. Now, that said, the design of the backplate will affect how the flux "flows" through the motor.....but that doesn't mean that thick bumped is necessarily better than another design for a particular motor.</p><p></p><p>The bottom pictures looks more like the older XXX than it does the previous BTL (going from memory). In which case, the top plate is so thick on the XXX because it's an XBL^2 motor.....which means the coil is shorter than top plate.</p><p></p><p>This isn't a highly detailed post, but it should give you the jist of things. It really comes down to the goals of the design and the best way to acheive those goals. Everything is a trade off, and you just have the select the most appropriate set of trade offs for your design goals and target price.</p></blockquote><p></p>
[QUOTE="squeak9798, post: 6035272, member: 555320"] Xmax is dependent upon the geometry of the coil and the gap and control of the magnetic flux within the gap. In an overhung motor a taller topplate requires a longer coil to maintain the same amount of Xmax. Taller is not necessarily better as far as the coil is concerned as there are trade-offs here (higher inductance, more mass, etc). Having a bumped backplate/etc may give the coil more travel before damage occurs (Xmech), but it won't change the amount of [I]linear[/I] stroke the driver is capable of. Now, that said, the design of the backplate will affect how the flux "flows" through the motor.....but that doesn't mean that thick bumped is necessarily better than another design for a particular motor. The bottom pictures looks more like the older XXX than it does the previous BTL (going from memory). In which case, the top plate is so thick on the XXX because it's an XBL^2 motor.....which means the coil is shorter than top plate. This isn't a highly detailed post, but it should give you the jist of things. It really comes down to the goals of the design and the best way to acheive those goals. Everything is a trade off, and you just have the select the most appropriate set of trade offs for your design goals and target price. [/QUOTE]
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