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any1 ever do any testing on SVC vs DVC
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<blockquote data-quote="zinda" data-source="post: 8086812" data-attributes="member: 633054"><p>After some research I have found no conclusive testing results done by any testing labs that show any waveforms or spl test results. Furthermore I have now learned what or from what the DVC sub was made to do. It seems that the second voice coil was originally added to control or correct any spikes in output frequency that may occur, whether it's caused by speaker enclosure or placement. What was done was a test was run after the sub was installed and the second coil was used in reverse polarity along with a crossover and a resistor to use the bandpass signal sent to it to reduce any uneven output in an attempt to flatten the response!? I'm guessing old subs had major spikes in their response that was unique to each individual sub, probably due to hand made speakers having no set production type assembly. Resulting in varied response from person to person on who assembled them or even which types of materials were used in manufacturing if the Companies got new materials that varied from their suppliers.</p><p></p><p>I don't have any of the original manufacturers names who did this, I'm sure it was used on cheap subs as an easy way to achieve near flat response on each speaker without having to buy an EQ that will only correct overall sound and would be harder to "fix" sound in problem areas that have multiple subs in different locations like in a movie theater, corner locations may be boomy while center located would seem flat and with an EQ it would ruin the center sound when attempting to flatten the corners.</p><p></p><p>Overall the design may have changed from the original concept, since the response has stopped fluctuating wildly due to controlled manufacturing techniques and better modeling. What they were designed to do originally is something that was never con-vied or even considered when they started making the new DVC subs. I highly doubt that anyone has even thought about using a sub in this fashion for any car audio application?</p><p></p><p>I'll bet very few people even knew this was the original intended use of the second coil.</p></blockquote><p></p>
[QUOTE="zinda, post: 8086812, member: 633054"] After some research I have found no conclusive testing results done by any testing labs that show any waveforms or spl test results. Furthermore I have now learned what or from what the DVC sub was made to do. It seems that the second voice coil was originally added to control or correct any spikes in output frequency that may occur, whether it's caused by speaker enclosure or placement. What was done was a test was run after the sub was installed and the second coil was used in reverse polarity along with a crossover and a resistor to use the bandpass signal sent to it to reduce any uneven output in an attempt to flatten the response!? I'm guessing old subs had major spikes in their response that was unique to each individual sub, probably due to hand made speakers having no set production type assembly. Resulting in varied response from person to person on who assembled them or even which types of materials were used in manufacturing if the Companies got new materials that varied from their suppliers. I don't have any of the original manufacturers names who did this, I'm sure it was used on cheap subs as an easy way to achieve near flat response on each speaker without having to buy an EQ that will only correct overall sound and would be harder to "fix" sound in problem areas that have multiple subs in different locations like in a movie theater, corner locations may be boomy while center located would seem flat and with an EQ it would ruin the center sound when attempting to flatten the corners. Overall the design may have changed from the original concept, since the response has stopped fluctuating wildly due to controlled manufacturing techniques and better modeling. What they were designed to do originally is something that was never con-vied or even considered when they started making the new DVC subs. I highly doubt that anyone has even thought about using a sub in this fashion for any car audio application? I'll bet very few people even knew this was the original intended use of the second coil. [/QUOTE]
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any1 ever do any testing on SVC vs DVC
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