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<blockquote data-quote="jimrhit" data-source="post: 2640105" data-attributes="member: 573319">The dustcap is both for cone strength/breakup taming as well as a seal to force air back down through the gap to cool the coil.The steel plate and pole themselves are also heatscapes for the excess heat from the voice coil, so a moving coil (air movement aside) is better cooled than a static coil.&nbsp; The steel is not very quick to absorb heat, so many manufacturers add aluminum plates/vanes to aid in the cooling.As said before too, an Aluminum former is a very efficient method of VC cooiling too.&nbsp; This design, when thermally coupled with an Aluminum cone (think Pioneer VCCS) can increase power handing twofold in certain cases.Vent holes in the former and in the spider can be used in a few ways ... they can aid in cooling by allowing for more air flow ... and they can also slow down airflow/compression so that the mechanial compliance is more symmetrical in both directions, since forced air cooling can sometimes add too much distortion into the mix, so you have to sacrafice power handling for sound quality.</blockquote>

[QUOTE="jimrhit, post: 2640105, member: 573319"] The dustcap is both for cone strength/breakup taming as well as a seal to force air back down through the gap to cool the coil. The steel plate and pole themselves are also heatscapes for the excess heat from the voice coil, so a moving coil (air movement aside) is better cooled than a static coil. The steel is not very quick to absorb heat, so many manufacturers add aluminum plates/vanes to aid in the cooling. As said before too, an Aluminum former is a very efficient method of VC cooiling too. This design, when thermally coupled with an Aluminum cone (think Pioneer VCCS) can increase power handing twofold in certain cases. Vent holes in the former and in the spider can be used in a few ways ... they can aid in cooling by allowing for more air flow ... and they can also slow down airflow/compression so that the mechanial compliance is more symmetrical in both directions, since forced air cooling can sometimes add too much distortion into the mix, so you have to sacrafice power handling for sound quality. [/QUOTE]

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