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<blockquote data-quote="sundownz" data-source="post: 7922615" data-attributes="member: 549523">On something like an average 12&quot; surround you are looking at a geometric max of 27-35mm (31mm is a safe average) or so without damage compared to 58mm on our 12&quot; surround (the 55mm figure is a more linear figure, but 58mm is geometric max).So lets say 31mm x 1.0 (just a reference number) = 31 mm^3 of displacement x 2 = 62Then 58mm x 0.9 (90% of SD) = 52.2 mm^3 of displacement x 2 = 104.4Around 1.8 dB additional output when using the most of both. Even dropping to a more reasonable usage of, say, 40mm of travel...40mm x 0.9 = 36 x 2 = 72 = 0.4 dB of additional output.Doesn&#039;t take much to get a gain even with a bit of drop in SD //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gifWith all that being said -- theory only takes us so far and we&#039;ve seen larger gains in output compared to theory in initial testing -- We have already made a &quot;Hi-X&quot; version of the Z v.3 12&quot; model and have seen 1 dB gains on the meter vs stock models... a wider than average surround is used on them as well with an SD drop from stock cones -- and they don&#039;t gain nearly the throw.Theory doesn&#039;t hold up as you also have the non-linearity of the surround coming into play as well as the spider... and we mate these big surrounds with much large, more linear spiders than the small surrounds -- so it&#039;s not all apples to apples in the whole driver package //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif</blockquote>

[QUOTE="sundownz, post: 7922615, member: 549523"] On something like an average 12" surround you are looking at a geometric max of 27-35mm (31mm is a safe average) or so without damage compared to 58mm on our 12" surround (the 55mm figure is a more linear figure, but 58mm is geometric max). So lets say 31mm x 1.0 (just a reference number) = 31 mm^3 of displacement x 2 = 62 Then 58mm x 0.9 (90% of SD) = 52.2 mm^3 of displacement x 2 = 104.4 Around 1.8 dB additional output when using the most of both. Even dropping to a more reasonable usage of, say, 40mm of travel... 40mm x 0.9 = 36 x 2 = 72 = 0.4 dB of additional output. Doesn't take much to get a gain even with a bit of drop in SD [IMG]//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif[/IMG] With all that being said -- theory only takes us so far and we've seen larger gains in output compared to theory in initial testing -- We have already made a "Hi-X" version of the Z v.3 12" model and have seen 1 dB gains on the meter vs stock models... a wider than average surround is used on them as well with an SD drop from stock cones -- and they don't gain nearly the throw. Theory doesn't hold up as you also have the non-linearity of the surround coming into play as well as the spider... and we mate these big surrounds with much large, more linear spiders than the small surrounds -- so it's not all apples to apples in the whole driver package [IMG]//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif[/IMG] [/QUOTE]

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