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Subwoofers
88.9 mm xmax????????
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<blockquote data-quote="sundownz" data-source="post: 7796430" data-attributes="member: 549523"><p>Nobody needs to watch anything in action to know that the claimed 88.9mm figure is blatantly impossible due to the reasons I listed. If you do not understand the figures carry on... if you did you would already see that it's a BS claim on that model due to physical impossibility.</p><p></p><p>If you want an Earthquake sub that has REAL high excursion look at a HoleeS which has 44.5mm of simple coil over-hang -- this would translate into around 100mm p-p linear travel by 70% BL assuming the motor is deep enough to support it. If the article from Car Audio Mag is accurate (and it is linked on Earthquake's site so I assume it is) the sub would actually bottom out at 38.5mm ** which is still a very high x-max one-way... the surround and spiders of the driver are more than capable of this as well.</p><p></p><p><a href="http://www.earthquakesound.com/index.php?option=com_content&amp;view=category&amp;layout=blog&amp;id=13&amp;Itemid=57" target="_blank">News &amp; Reviews</a></p><p></p><p>"Horsepower for this gonzo subwoofer is provided by FEA (Finite Element Analysis) computer designed motor structure that includes four 19mm thick 275mm diameter stacked ferrite magnets sandwiched between the 38mm thick front plate and the chromed 20mm thick shaped T-yoke (a T-yoke combines the backplate and the polepiece to complete the magnetic circuit and focus all the magnetic energy in the front plate gap) with a 7mm deep bumpout to prevent the voice coil from “bottoming” (hitting the backplate on a rear stroke). Additional convection cooling is provided by a 20mm diameter pole vent and eight 9mm peripheral vents surrounding the pole vent and located on the bottom of the T-yoke bumpout. All in, this gives the HoleeS a total mounting depth of 14.25”.</p><p></p><p>The voice coil attached to the cone assembly is also pretty amazing. This is an extremely long voice coil and measures 127mm (5”) long and 76mm (3”) in diameter. The voice coil former material is black anodized aluminum and wound with an 8 layer (two 4 layer 1 Ohm windings) flat copper wire coil."</p><p></p><p>** 127mm long coil / 38mm top-plate / Quad 19mm magnet stack / 7mm bump-out</p><p></p><p>127mm - 38mm top plate = 89mm total coil over-hang = 44.5mm rear over-hang</p><p></p><p>76mm magnet + 7mm bump-out = 83mm total rearward clearance</p><p></p><p>83mm - 44.5mm = 38.5mm remaining clearance past over-hang</p><p></p><p>-----</p><p></p><p>So... even in terms of the company pricing structure how does it make sense to have a $300 sub with more excursion than the flag-ship $1500+ driver ?</p><p></p><p>If that still doesn't ring any bells for you I don't know what to tell you. Saying the driver in the original post has 88.9mm of x-max is like saying you put 2 gallons of water in a 1 gallon jug... or that you drove 4 miles on a 2 mile road. It just isn't possible and simple measurements prove it... I don't have to watch you in action trying to pour 2 gallons into the 1 gallon jug... common sense and logic tell me it's not possible.</p></blockquote><p></p>
[QUOTE="sundownz, post: 7796430, member: 549523"] Nobody needs to watch anything in action to know that the claimed 88.9mm figure is blatantly impossible due to the reasons I listed. If you do not understand the figures carry on... if you did you would already see that it's a BS claim on that model due to physical impossibility. If you want an Earthquake sub that has REAL high excursion look at a HoleeS which has 44.5mm of simple coil over-hang -- this would translate into around 100mm p-p linear travel by 70% BL assuming the motor is deep enough to support it. If the article from Car Audio Mag is accurate (and it is linked on Earthquake's site so I assume it is) the sub would actually bottom out at 38.5mm ** which is still a very high x-max one-way... the surround and spiders of the driver are more than capable of this as well. [URL="http://www.earthquakesound.com/index.php?option=com_content&view=category&layout=blog&id=13&Itemid=57"]News & Reviews[/URL] "Horsepower for this gonzo subwoofer is provided by FEA (Finite Element Analysis) computer designed motor structure that includes four 19mm thick 275mm diameter stacked ferrite magnets sandwiched between the 38mm thick front plate and the chromed 20mm thick shaped T-yoke (a T-yoke combines the backplate and the polepiece to complete the magnetic circuit and focus all the magnetic energy in the front plate gap) with a 7mm deep bumpout to prevent the voice coil from “bottoming” (hitting the backplate on a rear stroke). Additional convection cooling is provided by a 20mm diameter pole vent and eight 9mm peripheral vents surrounding the pole vent and located on the bottom of the T-yoke bumpout. All in, this gives the HoleeS a total mounting depth of 14.25”. The voice coil attached to the cone assembly is also pretty amazing. This is an extremely long voice coil and measures 127mm (5”) long and 76mm (3”) in diameter. The voice coil former material is black anodized aluminum and wound with an 8 layer (two 4 layer 1 Ohm windings) flat copper wire coil." ** 127mm long coil / 38mm top-plate / Quad 19mm magnet stack / 7mm bump-out 127mm - 38mm top plate = 89mm total coil over-hang = 44.5mm rear over-hang 76mm magnet + 7mm bump-out = 83mm total rearward clearance 83mm - 44.5mm = 38.5mm remaining clearance past over-hang ----- So... even in terms of the company pricing structure how does it make sense to have a $300 sub with more excursion than the flag-ship $1500+ driver ? If that still doesn't ring any bells for you I don't know what to tell you. Saying the driver in the original post has 88.9mm of x-max is like saying you put 2 gallons of water in a 1 gallon jug... or that you drove 4 miles on a 2 mile road. It just isn't possible and simple measurements prove it... I don't have to watch you in action trying to pour 2 gallons into the 1 gallon jug... common sense and logic tell me it's not possible. [/QUOTE]
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88.9 mm xmax????????
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