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<blockquote data-quote="ciaonzo" data-source="post: 8052287" data-attributes="member: 607015">The only way to extract the true differences between copper and aluminum is if we leave certain things static, like (L) and compliance and WW and layers, so that we may see differences in parameters.Almost everything would be affected by simply swapping out a same dimension copper coil with and aluminum one. We could do it again with same dimension flat vs. round of the same materials (copper flat vs. aluminum flat, copper round vs. aluminum round). Again, that&#039;s leaving all soft parts unchanged. Every option would have a very different set of parameters, including the impedance magnitude and efficiency.You can change spiders and such to compensate for the added or subtracted Mms in hopes of preserving power handling or efficiency, but now you&#039;re affecting Vas and Qms (among other things). You could change flux to address BL lost or gained, but now you&#039;re affecting Qes and sensitivity (again, among other things). This isn&#039;t just a simple matter of saying use flat or round for daily or for this amount of power. And it REALLY wouldn&#039;t matter, anyway, if the T/S parameters ended up being all wrong for the enclosure because you decide on flat or round, copper or aluminum for the aforementioned reasons.So, in the end, flat and round can sound different and that can impact sound quality. And for what it&#039;s worth, every single driver I have uses aluminum (flat and round) and the parameter sets vary, drastically. Some are dedicated SQ drivers, some are setup to tolerate considerable abuse. Some have ultra-low Fs figures with VERY light aluminum coils, some have highish Fs figures and incredible power handling with VERY heavy aluminum coils, and vice versa. It&#039;s all about the design goals and intended use.</blockquote>

[QUOTE="ciaonzo, post: 8052287, member: 607015"] The only way to extract the true differences between copper and aluminum is if we leave certain things static, like (L) and compliance and WW and layers, so that we may see differences in parameters. Almost everything would be affected by simply swapping out a same dimension copper coil with and aluminum one. We could do it again with same dimension flat vs. round of the same materials (copper flat vs. aluminum flat, copper round vs. aluminum round). Again, that's leaving all soft parts unchanged. Every option would have a very different set of parameters, including the impedance magnitude and efficiency. You can change spiders and such to compensate for the added or subtracted Mms in hopes of preserving power handling or efficiency, but now you're affecting Vas and Qms (among other things). You could change flux to address BL lost or gained, but now you're affecting Qes and sensitivity (again, among other things). This isn't just a simple matter of saying use flat or round for daily or for this amount of power. And it REALLY wouldn't matter, anyway, if the T/S parameters ended up being all wrong for the enclosure because you decide on flat or round, copper or aluminum for the aforementioned reasons. So, in the end, flat and round [I]can[/I] sound different and that can impact sound quality. And for what it's worth, every single driver I have uses aluminum (flat and round) and the parameter sets vary, drastically. Some are dedicated SQ drivers, some are setup to tolerate considerable abuse. Some have ultra-low Fs figures with VERY light aluminum coils, some have highish Fs figures and incredible power handling with VERY heavy aluminum coils, and vice versa. It's all about the design goals and intended use. [/QUOTE]

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