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<blockquote data-quote="sundownz" data-source="post: 7793034" data-attributes="member: 549523">The magnet slugs look to be 40mm tall, 50mm tops. Top plate is at most 15mm thick (probably less). Back plate is probably not bumped... but lets give it a 5mm bump to be fair.With a 50mm long coil and 15mm top plate you have 17.5mm of over-hang -- to the bottom of the magnets this leaves 22.5mm on the 40mm stack and 32.5mm on the 50mm stock... at tops with over-hang 27.5mm / 37.5mm one-way mechanical figures.This geometry yields ~21mm or so linear one-way. So by no stretch of the imagination does this sub have 88.9mm of anything measurable... the surround may handle that p-p but no other part of the sub would.---Before posting I found this :<a href="http://www.hometheatershack.com/forums/diy-subwoofers-general-discussion/50724-earthquake-sound-dbxi-15-a-3.html#post469169" target="_blank">Earthquake Sound DBXI-15 - Page 3 - Home Theater Forum and Systems - HomeTheaterShack.com</a>With a 12.7mm x-max figure that drops the coil length down to 35mm or so which would leave 10mm of over-hang and ~45mm of x-mech rearward with a slightly bumped back plate and 50mm stack. So I imagine they are listing distance from coil to back plate x 2 (peak to peak) -- but in this case the coil would have to exit the gap by nearly one inch to reach that level of travel (not happening).Just a BS spec.</blockquote>

[QUOTE="sundownz, post: 7793034, member: 549523"] The magnet slugs look to be 40mm tall, 50mm tops. Top plate is at most 15mm thick (probably less). Back plate is probably not bumped... but lets give it a 5mm bump to be fair. With a 50mm long coil and 15mm top plate you have 17.5mm of over-hang -- to the bottom of the magnets this leaves 22.5mm on the 40mm stack and 32.5mm on the 50mm stock... at tops with over-hang 27.5mm / 37.5mm one-way mechanical figures. This geometry yields ~21mm or so linear one-way. So by no stretch of the imagination does this sub have 88.9mm of anything measurable... the surround may handle that p-p but no other part of the sub would. --- Before posting I found this : [URL="http://www.hometheatershack.com/forums/diy-subwoofers-general-discussion/50724-earthquake-sound-dbxi-15-a-3.html#post469169"]Earthquake Sound DBXI-15 - Page 3 - Home Theater Forum and Systems - HomeTheaterShack.com[/URL] With a 12.7mm x-max figure that drops the coil length down to 35mm or so which would leave 10mm of over-hang and ~45mm of x-mech rearward with a slightly bumped back plate and 50mm stack. So I imagine they are listing distance from coil to back plate x 2 (peak to peak) -- but in this case the coil would have to exit the gap by nearly one inch to reach that level of travel (not happening). Just a BS spec. [/QUOTE]

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