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<blockquote data-quote="Kyle_Keating" data-source="post: 4793475" data-attributes="member: 582385">if its an overhung design, aluminum is going&nbsp; be louder and run cooler because of its huge&nbsp; mass to conductivity advantage.copper may be more conductivecopper may have better thermal coefficient.here is what people neglect:copper is nearly three times as heavy! generally i have noticed a 2dB drop in sensitivity which means, you&#039;ll have to put a lot more power into a copper coil into order for it to get as loud as an aluminum coil.Things get complicated when you consider the resonator SPL - port/passive radiator. The deal is here, mass is not so much affected which is why many/most SPL woofer are copper. The sensitivity of the resonator actually is about the same with copper or aluminum which means the copper gets the advantage with its thermal cooling properties. But how many of us here buy as speaker to play at one frequency?&nbsp; Any even so, the advantage is not very substantial, especially on the first burp.&nbsp; This is also reinforced with the fact that most SPL woofers&nbsp; are non-linear motor designs which mean they don’t have long overhung coils which means the coil mass itself is relativity less percentage of the moving mass. So switching it to copper is not going to be as detrimental as say a long overhung coil design.Copper becomes very advantageous when you’re confined to a limited space and you want to increase the BL to reduce the box volume requirements. Small box woofers are typically copper. So if you’re interested in making box, especially a ported one, look into copper coils.Other than that, aluminum is the way to go. Most people will benefit from aluminum which is why its used. Its not so much a cost issue.</blockquote>

[QUOTE="Kyle_Keating, post: 4793475, member: 582385"] if its an overhung design, aluminum is going be louder and run cooler because of its huge mass to conductivity advantage. copper may be more conductive copper may have better thermal coefficient. here is what people neglect: copper is nearly three times as heavy! generally i have noticed a 2dB drop in sensitivity which means, you'll have to put a lot more power into a copper coil into order for it to get as loud as an aluminum coil. Things get complicated when you consider the resonator SPL - port/passive radiator. The deal is here, mass is not so much affected which is why many/most SPL woofer are copper. The sensitivity of the resonator actually is about the same with copper or aluminum which means the copper gets the advantage with its thermal cooling properties. But how many of us here buy as speaker to play at one frequency? Any even so, the advantage is not very substantial, especially on the first burp. This is also reinforced with the fact that most SPL woofers are non-linear motor designs which mean they don’t have long overhung coils which means the coil mass itself is relativity less percentage of the moving mass. So switching it to copper is not going to be as detrimental as say a long overhung coil design. Copper becomes very advantageous when you’re confined to a limited space and you want to increase the BL to reduce the box volume requirements. Small box woofers are typically copper. So if you’re interested in making box, especially a ported one, look into copper coils. Other than that, aluminum is the way to go. Most people will benefit from aluminum which is why its used. Its not so much a cost issue. [/QUOTE]

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