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<blockquote data-quote="youdoofus" data-source="post: 8585382" data-attributes="member: 664079">If the cone was solid when you pressed on it, that means that you fused the coil to the motor structure. How this happens is that the coil gets too hot and the metal on the former expands and becomes soft, if it touches the magnet, then it runs the risk of melting itself to the ring inside the magnet and seizing. This is usually caused by clipping, which is when the woofer stays still for a microsecond on the top and bottom of the woofers throw from what is referred to as &quot;square waves&quot;. How high was the bass boost set on your deck? Sub output level?Refer to this image. The image on the left represents the woofers movement on an unclipped signal and the one on the right is clipped. The left side shows the woofer moving freely up and down according to the frequency its being given and the right shows the momentary stalling at the top and bottom of the stroke which causes heat. Clipping for a fraction of a second every once in a while isnt a big deal usually, but any longer is.<img src="http://www.electronics-tutorials.ws/amplifier/amp12a.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></blockquote>

[QUOTE="youdoofus, post: 8585382, member: 664079"] If the cone was solid when you pressed on it, that means that you fused the coil to the motor structure. How this happens is that the coil gets too hot and the metal on the former expands and becomes soft, if it touches the magnet, then it runs the risk of melting itself to the ring inside the magnet and seizing. This is usually caused by clipping, which is when the woofer stays still for a microsecond on the top and bottom of the woofers throw from what is referred to as "square waves". How high was the bass boost set on your deck? Sub output level? Refer to this image. The image on the left represents the woofers movement on an unclipped signal and the one on the right is clipped. The left side shows the woofer moving freely up and down according to the frequency its being given and the right shows the momentary stalling at the top and bottom of the stroke which causes heat. Clipping for a fraction of a second every once in a while isnt a big deal usually, but any longer is. [IMG]http://www.electronics-tutorials.ws/amplifier/amp12a.gif[/IMG] [/QUOTE]

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