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<blockquote data-quote="Papermaker85" data-source="post: 3758690" data-attributes="member: 572595">xmax in a design should be designed around power handling, freuqnecy response,&nbsp; alignment and desired output. so in other words if you want a high output lowend monster sealed you would opt for more xmax/larger boxesported on the other hand ESP subs like DD 9500 has 18-20mm xmax and you rarely exceed this firgue even with 3kw and huge boxes! the woofer is designed to have a narrower more limited bandwidth and designed to use the port over a wider bandwidth as well futher decresing excursion...most woofers with 25mm xmax in 2.25 cubes tuned to 35 need in axcess of 3KW to reach peak xmax.. this variers from woofer to woofer and excursion increase above tuning&nbsp; and lower tuned boxes require more excursion above tuning to reach the same output, but in general ported box woofers rearly exceed there xmax rating with rated power...i have learned over the years using the standad 2 cubed box with a 35hz tune 16-18mm xmax takes about 2kw to be reached and by this time a pair do 12&quot; drivers are doing well into the mid to high 140s...exceptions like the mag D2s which are often tunded low benfit from the higher xmax becasue they are designed to get low and sound great in smaller very low tuned boxes.. the result is above tuning 60-70hz teh increased xmax means increased output when power input is applied... this takes right at abut 1800 per driver to reach its limits, in 2 tuned to 30... xmax is so over hyped its not even funny..</blockquote>

[QUOTE="Papermaker85, post: 3758690, member: 572595"] xmax in a design should be designed around power handling, freuqnecy response, alignment and desired output. so in other words if you want a high output lowend monster sealed you would opt for more xmax/larger boxes ported on the other hand ESP subs like DD 9500 has 18-20mm xmax and you rarely exceed this firgue even with 3kw and huge boxes! the woofer is designed to have a narrower more limited bandwidth and designed to use the port over a wider bandwidth as well futher decresing excursion... most woofers with 25mm xmax in 2.25 cubes tuned to 35 need in axcess of 3KW to reach peak xmax.. this variers from woofer to woofer and excursion increase above tuning and lower tuned boxes require more excursion above tuning to reach the same output, but in general ported box woofers rearly exceed there xmax rating with rated power... i have learned over the years using the standad 2 cubed box with a 35hz tune 16-18mm xmax takes about 2kw to be reached and by this time a pair do 12" drivers are doing well into the mid to high 140s... exceptions like the mag D2s which are often tunded low benfit from the higher xmax becasue they are designed to get low and sound great in smaller very low tuned boxes.. the result is above tuning 60-70hz teh increased xmax means increased output when power input is applied... this takes right at abut 1800 per driver to reach its limits, in 2 tuned to 30... xmax is so over hyped its not even funny.. [/QUOTE]

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