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Low xmax vs. high xmax??
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<blockquote data-quote="sundownz" data-source="post: 7775300" data-attributes="member: 549523"><p>The question of how much x-max you need really depends on the application... often times in a ported box the highest x-max is not necessary as the port reduces excursion at tuning and 1/3 octave in either direction. For example... tuning to 30 Hz reduces cone excursion from 25 Hz to 40 Hz quite a bit. In a sealed box it becomes much more important.</p><p></p><p>You really want the RIGHT amount of x-max for your power rating and box application... in development of the SA-8 v.2 we measured full bandwidth SPL in the suggested enclosures from 25 to 80 hz. If we made the coil any longer (for more x-max) we lost output across the board at at rated or even 20% above rated power. We tried four different lengths -- the settled upon length and thus x-max offered the best output across the board at the rated power levels. So there is no reason to "fluff" the spec sheet with a super high linear x-max if all it does is REDUCE output at any reasonable power level.</p><p></p><p>These days with super powerful amps readily available it is pretty amazing how much people can get a sub to full excursion even AT tuning... for instance in my Jeep SPL box I can bring an NS v.2 to full surround limits of about 38mm or so one-way AT box tuning of 53 Hz (156dB). Allowing more movement would increase it's SPL potential -- in this case it would take a new surround / spider to do that (which I am working on).</p></blockquote><p></p>
[QUOTE="sundownz, post: 7775300, member: 549523"] The question of how much x-max you need really depends on the application... often times in a ported box the highest x-max is not necessary as the port reduces excursion at tuning and 1/3 octave in either direction. For example... tuning to 30 Hz reduces cone excursion from 25 Hz to 40 Hz quite a bit. In a sealed box it becomes much more important. You really want the RIGHT amount of x-max for your power rating and box application... in development of the SA-8 v.2 we measured full bandwidth SPL in the suggested enclosures from 25 to 80 hz. If we made the coil any longer (for more x-max) we lost output across the board at at rated or even 20% above rated power. We tried four different lengths -- the settled upon length and thus x-max offered the best output across the board at the rated power levels. So there is no reason to "fluff" the spec sheet with a super high linear x-max if all it does is REDUCE output at any reasonable power level. These days with super powerful amps readily available it is pretty amazing how much people can get a sub to full excursion even AT tuning... for instance in my Jeep SPL box I can bring an NS v.2 to full surround limits of about 38mm or so one-way AT box tuning of 53 Hz (156dB). Allowing more movement would increase it's SPL potential -- in this case it would take a new surround / spider to do that (which I am working on). [/QUOTE]
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Low xmax vs. high xmax??
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