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Car Audio Equipment
Subwoofers
4 inch four layer coil versus 3 in 8 layer coil?
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<blockquote data-quote="Buck" data-source="post: 8751021" data-attributes="member: 591582"><p>A 4" coil typically has superior cooling capacity. You'd need something like the nightshade's super long 4 layer 3" coil in order to begin matching heat dissipation. The super long 3" coils can get the heat dissipation of a 4" coil or close to it, but you wind up losing a lot of efficiency, because a lot of the coil isn't in the strongest gauss part of the motor, sacrifice you make for a super long coil. A 4" coil will typically have more of the coil itself centered in the gauss of the motor.</p><p></p><p>4" is about twice the circumference of 3", so a 4" coil is usually going to weigh a ton more.</p><p></p><p>So as far as high powered stuff goes:</p><p></p><p>3" 8 layer woofer: lower Mms, higher Fs, more efficiency, less inherent heat dissipation.</p><p></p><p>4" 4 layer coil: typically very high Mms, sometimes low or unusually low Fs (good for high power music), super good heat dissipation.</p><p></p><p>So my overall general statement, as I design for many 3 and 4 inch coiled woofers, is that now days, if you want to score loudly and be more efficient and accurate, do the 3" coil. If you want a more low end daily that'll take ungodly amounts of power, then do the 4" coil.</p><p></p><p>Depends on the woofer, about 2000-2500 w RMS is where I would start looking at 4" coils over 3", considering ferrite motors only. 3" coiled neo's might be the best overall coil and motor combination that exists for car audio.</p><p></p><p>4" coiled woofers tend to naturally have big Xmax inherently, I think it has to do with most 4" coiled woofers have 10" spider packs or larger spiders than 3" coiled woofers, and they get that Xmax while using the motor strength well, maybe unlike some of Sundown's super long 3" coils. Not hating, I really like their woofers, but I highly suspect the efficiency issues people have with those woofers are because of the super long coils are limited with how much of the coil can actually be inside of the usable gauss of the motor at any given time, because it's a smaller, concentrated area.</p></blockquote><p></p>
[QUOTE="Buck, post: 8751021, member: 591582"] A 4" coil typically has superior cooling capacity. You'd need something like the nightshade's super long 4 layer 3" coil in order to begin matching heat dissipation. The super long 3" coils can get the heat dissipation of a 4" coil or close to it, but you wind up losing a lot of efficiency, because a lot of the coil isn't in the strongest gauss part of the motor, sacrifice you make for a super long coil. A 4" coil will typically have more of the coil itself centered in the gauss of the motor. 4" is about twice the circumference of 3", so a 4" coil is usually going to weigh a ton more. So as far as high powered stuff goes: 3" 8 layer woofer: lower Mms, higher Fs, more efficiency, less inherent heat dissipation. 4" 4 layer coil: typically very high Mms, sometimes low or unusually low Fs (good for high power music), super good heat dissipation. So my overall general statement, as I design for many 3 and 4 inch coiled woofers, is that now days, if you want to score loudly and be more efficient and accurate, do the 3" coil. If you want a more low end daily that'll take ungodly amounts of power, then do the 4" coil. Depends on the woofer, about 2000-2500 w RMS is where I would start looking at 4" coils over 3", considering ferrite motors only. 3" coiled neo's might be the best overall coil and motor combination that exists for car audio. 4" coiled woofers tend to naturally have big Xmax inherently, I think it has to do with most 4" coiled woofers have 10" spider packs or larger spiders than 3" coiled woofers, and they get that Xmax while using the motor strength well, maybe unlike some of Sundown's super long 3" coils. Not hating, I really like their woofers, but I highly suspect the efficiency issues people have with those woofers are because of the super long coils are limited with how much of the coil can actually be inside of the usable gauss of the motor at any given time, because it's a smaller, concentrated area. [/QUOTE]
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4 inch four layer coil versus 3 in 8 layer coil?
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