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<blockquote data-quote="newusername" data-source="post: 5572894" data-attributes="member: 562064">The main purpose of the spider is to provide a restoring force to the speaker, returning the coil to the rest position where it is centered nicely beside the top plate and within the gap.When the coil moves, the spider is stretched.&nbsp; The further the spider is stretched, the more it resists moving further.&nbsp; This is an increase in stiffness (the same as a decrease in compliance), which can result in a loss of output and/or increased distortion.A progressive roll spider is designed to keep the stiffness of the suspension as constant as it can throughout the coil&#039;s motion.&nbsp; The further the coil moves, the more useful it is, so they are more common in longer-throw subwoofers (since that sort of excursion is required for high output at low frequencies).&nbsp; It is still useful, though, in virtually any speaker that seeks more &quot;clean&quot; throw than other speakers of a similar size.&nbsp; You must still be careful, however, to avoid using a spider that would easily allow the driver to encounter mechanical damage from over-excursion; in particular, it is useful to make the spider significantly stiffer at the outer edges of the coils travel to prevent the coil and former from hitting the backplate.</blockquote>

[QUOTE="newusername, post: 5572894, member: 562064"] The main purpose of the spider is to provide a restoring force to the speaker, returning the coil to the rest position where it is centered nicely beside the top plate and within the gap. When the coil moves, the spider is stretched. The further the spider is stretched, the more it resists moving further. This is an increase in stiffness (the same as a decrease in compliance), which can result in a loss of output and/or increased distortion. A progressive roll spider is designed to keep the stiffness of the suspension as constant as it can throughout the coil's motion. The further the coil moves, the more useful it is, so they are more common in longer-throw subwoofers (since that sort of excursion is required for high output at low frequencies). It is still useful, though, in virtually any speaker that seeks more "clean" throw than other speakers of a similar size. You must still be careful, however, to avoid using a spider that would easily allow the driver to encounter mechanical damage from over-excursion; in particular, it is useful to make the spider significantly stiffer at the outer edges of the coils travel to prevent the coil and former from hitting the backplate. [/QUOTE]

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